( Dell Inspiron 545 mini tower Windows 7x64 home premium (not activated), avg installed, recent restore to factory settings) Hi, i guess i should explain a fair bit about how i got into this situation so skip this paragraph to see whats actually happening. it started when i installed a virus (not on purpose) on my PC when i clicked on the application the computer crashed and when it started up it went into a blue screen, so I did restore to before i installed the program and this made it worse. when the pc started up i got the classic black screen with cursor. so long story short i Restored to Dell factory image. and heres where i am now. After the Restore my pc became unbelievably unstable with Bsod`s such as irql not less or equal and system service exception. but it would start up occasionally but crash if anything strenuous happens, so i managed to install avg and other items like itunes blue screen view e.t.c. i then updated all the drivers by right clicking on computer then manage E.t.c. this seemed to stabalize it a bit, but now when i try to install .net framework 4 it crashes about 3 minutes into the install and then does a blue screen of Irql_not less or equal (which if my memory serves me correctly is the first crash on my dmp file ill add later) and it keeps on staring up and BSODing and some times crashing on the welcome screen with the spinning blue circle and the funky back ground. So now im not sure whether to install windows updates cus people are saying they fail sometimes and i cant install .net framework, and my pc is occasionally unstable. And ill add that i have run memtest and that came up with no errors and i have also run dskchk, with no errors found and many other tests including changing ram places and removing ram and changing graphics cards. So any help will be gratly Appreciated thanks!! P.s here are the DMP fules from the first crash from installing .net (or atleast trying to) right up to the last crash when i got bored and shut it down for a while.