last night windows updated
Definition Update for Windows Defender - KB915597 (Definition 1.97.757.0)
Installation date: ‎2/‎2/‎2011 3:10 AM
Installation status: Successful
Post that … Nvidia Drivers are crashing. Is anyone facing same problem. Using Win 7 64 Bit
no I also updated my windows yesterday and Im not facing any such problem… May be its a driver problem update your Nvidia drivers to 266.58…
already uninstalled n re-installed…
the latest one 266.58
ohk then try older version of nvidia and if it still crash then restore your windows…
it was working till last night …its just this update which has happened since then. are you on 64 or 32bit? and is this particular release installed?
and i have recently bought card so just checked even the previous version i was running game was on was also 266.58
Im on 64bit and my system is running fine… Just restore your system… Windows Defender is not that important 
switched off defender still not working … plus restore stupid updated today