sorry for the late reply.
As long as you have a CD-RW or DVD-RW drive, you can restore all of your personal data (music, documents, favorites, etc) and re-format your PC.
This gives you the "new" windows experience, and gets rid of all your junk.
Here is a guide to reformatting Windows. It takes about 1-2 hours, and you'll have to reinstall drivers after.