I have an issue with my computer that I really don't know how to solve (if there is a solution). I have a Packard-Bell EasyNote SJ51, which had Windows Vista for a long time. Tired of Windows Vista, I installed Windows 7 about 2 months ago. I was browsing through my facebook, when suddenly the browser started toggling in and out of fullscreen mode really fast, so I couldn't really read anything. I didn't know what was going on, so I restarted my computer. When it turned on, it appears some windows boot files were missing and I never managed to start windows again. As I thought it was some kind of virus, I formatted my hard drive and installed Windows 7 again, but the problem persisted. Then I installed Windows XP and eventually returned to Windows Vista, but still the problem persists, whenever I open a window it keeps toggling in and out of fullscreen mode. I really don't know what's going on and whether this is a hardware problem or not. I really wish you could help me with this one.