HELP!!!!

I am in need of some assistance, dear friends...
The computer I use strictly for web browsing has started slowing down significantly, and the CD-ROM is no longer functioning. I attempted a workaround by removing the hard drive and installing Windows XP onto it using a different PC (it was previously running Windows 7), and everything worked perfectly there. However, once I reinstall the drive into the original machine, everything seems fine initially, but as soon as the Windows XP loading screen appears, the monitor turns blue and the system immediately restarts. When I put that same drive back into the second computer, it works without issue.
If anyone could offer some guidance, I would be most grateful.

You can't just swap out a hard drive and expect everything to work right away; you're looking at totally different drivers, so it won't be that simple. I guess you'll need to install Windows using a USB stick—you've got to download a Windows ISO image first and then use Rufus to make the drive bootable.

I also suspect the driver is the culprit, though I was worried I might have actually fried my hard drive. I'm going to go ahead and reinstall Windows 7 on it. Thanks for the help.