The most popular Blue Screen of Death error in Windows is the STOP 0x0000007B error, sometimes called the 0x7b error or the "INACCESSIBLE BOOT DEVICE" BSOD.
This BSOD (which is actually the common name for what's called a STOP Error) could mean that there's a serious hardware problem with a hard drive controller, a driver issue, or even a boot sector virus.
See How To Fix STOP 0x0000007B Errors for a complete troubleshooting guide. A common solution to 0x0000007B errors, especially in Windows XP, is to disable AHCI mode (or change it to Legacy, IDE, or whatever the other option is) in your computer's BIOS. However, I highly recommend looking at the complete troubleshooting guide I just linked to so you can work through the problem properly. You don't want to make it worse.
Have you ever seen the STOP 0x0000007B BSOD before?