Here is some help for possibly recovering your data.
1st check your old machine with a memory tester.. I recommend
http://www.memtest.org/ where you can download either a floppy disk image or a CDrom bootable image. While you might have a virus problem.. it could also just be a memory issue, the computer world is discovering as they squeeze the chips to smaller and smaller sizes that random cosmic ray strikes (which happen every where all the time) can and do cause memory chips to fail. All the big super fast machines and nearly all server class machines now default to Error correcting memory, but home/office/game machines still use the cheaper memory that won't detect when memory chips go bad with random bit flips.
Unplug your Hard Drive.. and just boot from the image.. assuming the computer passes all tests, you will know your hardware is still ok and the problem is on the Hard Drive.
Once you have verified the rest of the hardware works.. buy, beg, borrow, or hmm (ok maybe not here [steal]) the smallest, cheapest hard drive you can find. And install Linux on the computer. This will allow you to sand box the windows drive and use anti-virus tools to test the drive without concern for cross computer contamination.
OR even better.. find a friend who is a Linux expert and have him check your drive.
After your drive has been declared clean of virus, you can either do a copy from machine to machine or buy a fairly inexpensive adapter card to allow you to install your old drive on your new machine to do a copy of your important files. I have known techs who frequent the local high tech electronics store and after quickly using the purchased item for the one time only use.. return the item to the store for credit. Personally I would never do that.. I'm a pack rat.. I keep those things for the next time... even if I am fairly certain there won't be a next time need for that item.. sigh
Just hope you never get caught like this poor guy
http://www.wired.com/gadgetlab/2012/08/ ... n-hacking/ and the follow posting of
http://www.wired.com/gadgetlab/2012/08/ ... overy/all/
The moral of his story.. if the info you put on a computer is important to you .. MAKE A BACKUP and store it somewhere else.. that can't get damaged/hacked/destroyed in a local cataclysm.