If you have your friend's disk...you can wipe and reformat your hard drive.
You need to back up your important data first, or you will lose all of it.
You will also have to reinstall all of your software.
Given the alternative between that and buying a new computer (which you will still have to reinstall all of your software on) it's certainly worth a shot.
There are other options we should try before we go straight to the reformat.
See edited post.
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