Hi,
Prolog:
I've reinstalled my OS last night. Did the standard things like installing a recursive Update for Windows XP SP2 (Winfuture Update Pack), Chipset Drivers etc ... After that I thought lets install the Omega Drivers.
Due the installation process everything works fine. No Errors. But after a reboot I saw this 640x480 4bit Screen. Hum ... something went wrong i thought ...
I was navigating to the Desktop Prefernces Tab but what happend ... "Invalid Desktoppreferences [cut] the installed driver is not compatible with this windows version"
Never heard that before! Normal way for me was to read the forum entrys ... so now im here .. read the post and thought "No, that cant be I wont use this oversized ati CCC %&$!"
After hours of testing, note i've reinstalled my system so it wouldnt be hard for me to kill my system again if something went wrong

, i found a solution that worked for me.
// Note: Yes, i reinstalled my system more than 3 times at this day, not just only for reproducing the following "it-worked-for-me"-solution dont know if it will work in other cases. But i hope it'll help =)
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System Specs in short:
ASUS A7V600-X (VIA KT600 Chipset) using VIA_HyperionPro_V508A Drivers
Sapphire ATI 9600XT 256MB
Windows XP
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My personal solution (as it worked for me)
1. open the Controllmanager navigate to "Systemdevices" and check if the "VIA CPU to AGP Controller" is NOT from Microsoft. (Should be named VIA CPU to AGP2.0/AGP3.0 Controller" if the VIA Driver is installed)
For me the VIA Hyperion driver set didn't update this driver so i must Right-click "Update Driver"->"Software from list"->"don't search ..."->"Source"-> manually navigate to the before extracted VIA_HyperionPro_V508A\viaagp\DRIVER\WinXP Folder, OK, follow instructions. Reboot.
ATTENTION: DONT add manually the Driver through the Hardwaremanager. Its totally recommended to just update the driver. If you add the driver to the Hardwareprofile you'll have 2 VIA CPU to AGP Controllers and the system will NOT, i repeat NOT boot. Safety Mode (F8 at boottime) is NOT accessible then. In my case system reboots everytime after Bootlogo, regardless which option i've chosen in the menu. You have been warned
If you've overread this passage you can manually remove the driver file under %SystemRoot%\system32\drivers\VIAAGP1.sys with the Windows Repair Console or UBCD4Win
http://www.ubcd4win.com/
2. After that use the DriverCleanerPRO from
http://drivercleaner.net/professional.html (Current is Version 1.5) and check "Multiple..."
3. Now add ALL ATI related things "ATI, ATI CCC, ATI RAGE..." and so on. And if i say all i mean all ATI related ignoring "i dont have installed it i know it, why should i check it?" Just do it

Start the process. If DCPro is finished go on with step number 4
4. Restart your PC and install the Omega drivers. (in addition i recommend to install ONLY ATT.)
// If everything is now ok, skip the next steps
In my case my monitor now only operate at 60Hz regardless setting the Monitor to 85Hz in the Monitor Preferences Tab. I figured out that if i right-clicked the ATT Icon Display->Default Single Display my Monitor refreshes and operates at 85Hz
(or simply play with the Resolution Control, in the desktop preferences tab)
Furthermore everytime i did a reboot my monitor-driver was killed or replaced with "MS shipped drivers, to "EMPTY" or "Standardmonitor". So i tryed to use the ATi RefreshFix-Tool.
5. Download ATi RefreshFix for Win XP and Win2k from
http://www.radeon2.ru/refreshfix_eng.html and reboot again.
6. Extract the Zip-File to somedir execute RefreshFix.exe. In my case it showed a warning message "Native Modes not set, Fixit?" Click on Fix&Reboot.
- Have Fun -
Some additional cogitations and logs
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I used the OmagaDrivers based on Cat6.5 on my long used Windows XP. Installed it with no errors and no problems after Uninstalling ATI Cat 6.3 through Softwaretab under Systempreferences and after using the DriverCleanerPro (Thats my default action if i decide to install a 3rd Party driver).
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This 640x480 at 4bit problem only occurs at "fresh" installing Windows XP with Omega Drivers based on Cat 6.5 in my case. As i said i've never seen that before since Cat 5.0.
So i think it could be a "Driver Scrap"/Prefetch/Driver Cache Problem. I mean Windows XP is shipped with ATI Radeon 9600 WHQL Drivers and if i install the Omega Drivers based on Cat 6.5 this problem occurs. Maybe the 6.5 Drivers are not reverse compatible to some files (Code Change?) ? Or if some are mixed with MS <-> ATI drivers? Some files are loaded/in use so those are blocked to delete/replace?
A Log entry of my System Event Log:
Eventtype: Error
Eventsource: ati2mtag
EventCategorie: None
EventID: 4
Date: 15.06.2006
Time: 22:00:23
User: Not applicable
Beschreibung:
You are running different builds of the miniport and display driver. Please use a matched pair.
Datas:
0000: 0e 00 04 00 01 00 5e 00 ......^.
0008: 00 00 00 00 04 00 01 c1 .......Á
0010: 1c 00 00 00 00 00 00 00 ........
0018: 00 00 00 00 00 00 00 00 ........
0020: 00 00 00 00 00 00 00 00 ........
0028: 04 00 01 c1 ...Á
Note: I dont have those errors now. This entry repeats itself 13 times
Timecodes:
22:00:23
22:00:23
22:00:20
22:00:20
22:00:20
22:00:20
22:00:20
22:00:20
22:00:19
22:00:19
22:00:19
21:59:16
21:59:16
This Block repeats itself every startup as i had this 640x480 4bit thing. One time only 2 or 5 entrys of this error is listed.
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Furthermore Windows XP is trying to detect the drivers after installation&reboot procedure of OmegaDrivers. Maybe at this point something went wrong. The only thing i can see is the "Automatic Installation of Hardwaredrivers".
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After using the DriverCleaner Windows XP didn't recognize my 9600XT .. it said "Videocontroller" for Primary Monitor Out and "Videocontroller (VGA)" to Secondary Monitor Out. So i think ati drivers were completly wiped out of my system. But i dont know .. because at this point my resolution was set to "1280x1024" at 32bit with 60Hz connected to "Standardmonitor" ... I dont know much about driver installation procedure or "in-deep"-details of the Grafic System , but in this case i think silently "why can i run at 1280x1024 in this depth. Ok in this state i have a poor grafic acceleration but hey how can it be?"

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Btw here is the DriverCleaner Log file
--------------------------------------------------------
- ATI WDM
- ATI Uninstall Utility
- ATI Remote Wonder
- ATI MMC
- ATI IGP Raid
- ATI IGP ATA
- ATI IGP
- ATI HydraVision
- ATI CCC
- ATI
Registry Deleted (HKEY_CLASSES_ROOT\CLSID\{266EEE40-6C63-11cf-8A03-00AA006ECB65})
Registry Deleted (HKEY_CLASSES_ROOT\CLSID\{71F96460-78F3-11d0-A18C-00A0C9118956})
Registry Deleted (HKEY_CLASSES_ROOT\CLSID\{71F96462-78F3-11d0-A18C-00A0C9118956})
Directory Deleted (C:\Programme\ATI technologies\UninstallAll)
Registry Deleted (HKEY_CURRENT_USER\Software\ATI)
File Deleted (C:\WINDOWS\Prefetch\CLI*.*)
File Deleted (C:\WINDOWS\Prefetch\ATI*.*)
File Deleted (C:\WINDOWS\system32\ati2cqag.dll)
File Deleted (C:\WINDOWS\system32\ati2dvag.dll)
File Deleted (C:\WINDOWS\system32\ati2edxx.dll)
File Deleted (C:\WINDOWS\system32\ati2evxx.dll)
File Deleted (C:\WINDOWS\system32\ati3duag.dll)
File Deleted (C:\WINDOWS\system32\atikvmag.dll)
File Deleted (C:\WINDOWS\system32\ativvaxx.dll)
File Deleted (C:\WINDOWS\system32\ati2evxx.exe)
Directory Deleted (C:\ATI)
Directory Deleted (C:\Programme\InstallShield Installation Information\{9B94BE6F-7CA3-4C40-A266-62667FF746CC})
Directory Deleted (C:\Programme\InstallShield Installation Information\{43801800-CFEE-11D2-A41B-006097B55AD3})
Registry Deleted (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\OpenGLDrivers\ati2dvag)
Registry Deleted (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\AtiExtEvent)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\CurrentcontrolSet\Servi ces\ati2mtag)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servi ces\Atierecord)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servi ces\Eventlog\Application\ATI Smart)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servi ces\Eventlog\System\Ati HotKey Poller)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servi ces\Eventlog\System\ati2mtag)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\ Root\LEGACY_ATI_HOTKEY_POLLER)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\ Root\LEGACY_ATI_SMART)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root \LEGACY_ATI_HOTKEY_POLLER)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root \LEGACY_ATI_SMART)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\ ati2mtag)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\ ATI Smart)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\ Atierecord)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\ Eventlog\Application\ATI Smart)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\ Eventlog\System\Ati HotKey Poller)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\ Eventlog\System\ati2mtag)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Enum\Root \LEGACY_ATI_HOTKEY_POLLER)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Enum\Root \LEGACY_ATI_SMART)
Registry Deleted (HKEY_LOCAL_MACHINE\SOFTWARE\CLASSES\CLSID\{EBB584 5F-CA80-11CF-BD3C-008029E89281})
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\C lass\{4D36E968-E325-11CE-BFC1-08002BE10318}\0000)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\C lass\{4D36E968-E325-11CE-BFC1-08002BE10318}\0001)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\V ideo\{577651A9-A067-4EA9-95F9-3A582D04C041})
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\V ideo\{81301B3A-30D7-4181-9986-22CF20AFFA7C})
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Control\C lass\{4D36E968-E325-11CE-BFC1-08002BE10318}\0000)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Control\C lass\{4D36E968-E325-11CE-BFC1-08002BE10318}\0001)
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Control\V ideo\{577651A9-A067-4EA9-95F9-3A582D04C041})
Registry Deleted (HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Control\V ideo\{81301B3A-30D7-4181-9986-22CF20AFFA7C})
I Hope this will help.
regards luricos
PS: And i hope you can understand my english
