Running a Registry cleaner?

Hi my desktop computer has just popped up the windows blue screen error. I have tried restarting the computer numerous times to no avail. I have been told to run a registry cleaner to help fix this problem. How do i run a registry cleaner on a computer that has the blue screen error that never goes away? We even tried booting from the windows xp disk but that didn’t work at all, the disk did not even load up.

So I was working with ITunes and my new IPod on my Acer Ferrari 4006 when the computer hung up. I waited about an hour with no luck and shut down and restarted the computer. Now it takes about 30 minutes to start and when it gets to windows the "system" process is using 100% CPU at all times. I have ran Kaspersky Anti-Virus Personal, Spybot, Adaware, and CleanMyPC Registry Cleaner with to no avail.

Also, when I start the computer, the bluetooth light on the front comes on, then turns off and doesn’t respond to any depression of the button.

I think that the problem I’m having is with the USB devices actually looping, but I dont know how to stop them. Any ideas would be greatly appreciated!! Thanks!
So I was working with ITunes and my new IPod on my Acer Ferrari 4006 when the computer hung up. I waited about an hour with no luck and shut down and restarted the computer. Now it takes about 30 minutes to start and when it gets to windows the "system" process is using 100% CPU at all times. I have ran Kaspersky Anti-Virus Personal, Spybot, Adaware, and CleanMyPC Registry Cleaner with to no avail.

Also, when I start the computer, the bluetooth light on the front comes on, then turns off and doesn’t respond to any depression of the button.

I think that the problem I’m having is with the USB devices actually looping, but I dont know how to stop them. Any ideas would be greatly appreciated!! Thanks!

PLEASE NOTE: I have run all the virus/spyware/malware programs I need to… the program this is using 100% of the CPU is the SYSTEM Process (not the system idle process)…