Just a blank blue screen could mean that your windows was wiped out, but theres no guarantee your data was. If it was a virus , generally they have only one set purpose... Of course if that set purpose was to format c:/ you're not getting your data back. I digress.
On an off chance that something happened to your video card/motherboard, you may need to get that repaired. I've never seen a computer virus simply not allow you to boot into windows with just a blue screen. It's more likely something occured to your video card but it's simply a guess with nothing to back it up.
If you want to get your data off, buy a Universal Hard Drive Adapter (the one I use it this one) -> http://www.newertech.com/products/usb2_adaptv2.php
You'll need to remove the hard drive from your infected machine and attach it to the adapter. You'll then attach the other end to a non-infected machine and it will appear as an external hard drive does (mass storage device). Click into the drive, go into Documents and Settings, find the correct "user" and simply drag and drop it onto another computer.
You can also use this device to scan for the virus. When you connect it to a non-infected machine, simply scan it with whatever program you want.