I can't place blame on either nVidia, or Windows, however there seems to be a serious issue with most of the driver versions released for Windows Vista. Specifically the nvlddmkm.sys driver. There are 20+ pages on a separate forum which many many people have come forward expressing their concern about the same issue. The issue revolves around an error message:

"Display driver nvlddmkm stopped responding and has successfully recovered."

I feel that this matter should be brought to the attention of various forums in hopes someone new can come up with a solution, or knows how to get nVidia, or Microsoft to at least acknowledge there is a serious issue with the WHQL driver(s).