Hi
An option may be to create a Ubuntu disk on another PC and boot your computer from that.
I've done this a number of times on computers that wouldn't boot to Windows.
That gave me the opertunity to move the data to DVDs or an external hard drive.
It only takes a few minutes to make the disk, and it will boot almost anything, at boot just skip the install option and boot from the disk.
If it works it would confirm that the hardware on your computer is working, and reinstalling Windows may get everything working again.
Another option is to buy a universal HD connector and romove your hard drive and plug it into another PC and backup your files.
Download Ubuntu Desktop | Download | Ubuntu
You can get an adapter from Amazon...