What seems to be going on from your description is the video signal is going somewhere other than your laptop display. You said you tried changing the resolution, which may have helped, but does not seem to have. Did you try using the basic video option?
Windows does supply driver updates for devices, and video is one they seem to do. In safe mode you should be able to roll back a video driver to correct the problem or replace it. Since you state you have re-installed your system, this would not make sense unless you allowed the drivers to be reloaded.
Any chance you have your system set to use dual monitors? Have you tried an external monitor to test?
And viruses do seem to be evident now for some reason. It is hard to say what one of those might do. Possibly running a bootable anti-virus might help.
How are you dual booting, using the Windows 7 boot or GRUB?