I started having blue screens of death about a year ago.I updated my graphic drivers and did some other things i saw online.It was really annoying,but it stopped.For like 4-5 months i didn't got any blue screens(only had some lags when i connected it to my TV).Now i'm having blue screens again.Sometimes pc doesn't even boot up,or freezes at windows logo.By the way i have a Nvidia gt220 graphic card.Do i have to update it again??Should i format my pc???HELP!!!!