My computer was running windows XP and then upgraded to windows 7. And because the sounds and video doesn't functioning well bcoz of incompatibility. now I decided to go back to windows Xp. when I'm reformatting an error just showing. it says: "A problem has detected and windows has been shut down to prevent damage to your computer If this is the first time you've seen this stop error screen, restart your computer If this screen appears again follow these steps: Check for viruses on your computer. Remove any newly installed hard drive controllers. Check your hard drive to make sure it is properly configured and terminated. Run CHKDSK /F to check for hard drive corruption and then restart your computer." please can somebody help me. please please..