I have a Toshiba Satalite with vista home premium and I am having problems with my screen flashing when I first login. The screen turns black and then turns blue for like two or three seconds.  Also over the pass few DAYS I have lost about 4 or 5 GB of free space on my hard drive and have no idea where it went.  Also malewarebytes and trend micro didn't FIX the problem. Please tell me what I can do to fix this problem.Sounds like a hardware or maybe software issue.

Moved to Windows forum.Which Satellite model?
300 series are known for developing video chip issues.My model is Toshiba Satellite A135-S4467Did you try to REINSTALL video driver?I don't believe this has anything to do with video becuase I have talked to someone else who has had this problem and he reinstalled the video driver and nothing worked. He ended up having to do a system RECOVERY.  But before I do a system recovery I would like to know if anyone else has had this problem and what they did to solve it.Can i ask why you wouldn't want to attempt re-installing the video drivers ? ?
It won't hurt...trust us.tryed reinstalling video drivers and it did nothingConnect external monitor, and see, if same thing happens.