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I suspect that the viruses had infected some of the files that windows needed to boot up. The moment you ran the Mcafee, the scanning might have deleted or quarantined those files. That is the reason you're having this Loading PBR message because it is now trying to boot from the network and not from the hard drive. You will need to repair windows using the CDs that came with the computer (the Operating system CD/DVD) and run CHKDSK /R at the screen where it says 'repair your computer using the command prompt". If this does not work, chances are, you may need to reinstall windows and everything and that all information in your hard drive will be wiped out.
the resolution set by default when you load your graphics driver is outside the range of your monitors capability.
try starting in safe mode then adjust your resolution to 640 by 480 then restart.
if this works, adjust upwards to 1024 by 768
then up again till the screen blanks.
when it does, dont panic, wait 20 seconds and the settings will restore - you then have the optimum settings for your monitor.
In some cases, the motherboard causes the screen to go blank and not load any program. Thats what happened to my HP Laptop. I called the company and explained them that nothing will load up and the screen went blank and they replaced the Motherboard.
So In tis case I think You need a new Motherboard.