I had several CAD drawings open at once, which is normal when I am using AutoCAD. Half way through the day I opened another drawing after a few seconds it would freeze and a message would pop up (see attached image "ERROR FIRST”) and then cursor turned into a circle as it was "thinking". Then another message pops up (see “ERROR SECOND”) and I have to close the program. I tried to reboot but it didn't fix it.
I signed onto another employees user on the same computer and the AutoCAD is working fine.
Not a supported combo, so you are out on your own.
Looks like you have AERO theme running in Win7: turn it off, make it look like WinXP using the Windows Basic Theme. That helps 90% of users with similar issues. And as you notived, perhaps a new Windows Profile wuld help too.