The propsys.dll is a Windows file and is more than likely not the actual cause of your problem.
Can you boot to the repair options using F8 and try using the basic video choice? Or last know good configuration? What the heck, try whatever you can.
Have you tried an anti-virus? There are some that run at boot.
If you have any dump files, you could zip and attach them using the paperclip.
There is a BSOD forum if you decide to go over there.