I'm betting you acquired a virus.
You can probably use the ultimate boot CD to transfer your data to an external drive 
and then do a clean install.
Or you can use an empty hard drive with no other hard drives connected and load windows 
on it.
Play around with it for a little bit to make sure your CPU usage is not running 100%.
Do a google search for AVG Anti-virus (free version), download and install it.
Shut down, connect your old C: drive as a slave to the new drive making sure both 
have the jumpers set correctly (new:master old:slave).
Boot the PC and transfer the files you need to the new drive.
If AVG detects a threat while you transfer files, stop and delete the offending file 
before you continue.
After the files are transfered, delete the partition on the old drive.
At this point the choice is yours what you want to do.
You can format the old drive and use it for storage or start over with the old drive 
by re-installing windows on it.

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