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Does the system periodically freeze using the Acer OEM drivers from their website?
If it does, it is likely your system is suffering from over-heating. Try cleaning the vents, and make sure the fan is working properly.
You could also try installing ATI Catalyst Mobility drivers, they may work better with your system than Omega Drivers. You may still need to mod the drivers however, but you can download some of them from here:
http://www.station-drivers.com/page/...20mobility.htm
Assuming it isn't Driver / Graphics chip related, make sure you have:
1) Proper Power management settings and CPU driver for your model
2) Defragmented Harddrive
3) Correct and updated Codec packages installed for the video type in question.
4) DMA support is enabled for both harddrive and CD/DVD drive.
Good luck, and take care.
- Randomness