Does it do it if you do a clean boot? (instructions here: http://support.microsoft.com/kb/929135)
I use to get this on my laptop back soon after Windows 7 came out and it was the generic Nvidia driver I was using, removed it and popped the vendors own driver on (even though it was older) and it worked fine afterwards. Oddly when I later updated to a brand new Nvidia beta driver it was still OK.
I did note that in my eventlog at the time there was a warning when I was switching users, I can't remember the detail but strangely it wasnt' an error as such, just a warning.
If I did a clean boot, I didn't have the issue though, so it was obviously third party software or drivers and not a hardware (GPU/Monitor) issue.
I use to get this on my laptop back soon after Windows 7 came out and it was the generic Nvidia driver I was using, removed it and popped the vendors own driver on (even though it was older) and it worked fine afterwards. Oddly when I later updated to a brand new Nvidia beta driver it was still OK.
I did note that in my eventlog at the time there was a warning when I was switching users, I can't remember the detail but strangely it wasnt' an error as such, just a warning.
If I did a clean boot, I didn't have the issue though, so it was obviously third party software or drivers and not a hardware (GPU/Monitor) issue.
i'm fairly certain the issue is related to our GPU/drivers.