I keep thinking you've got more than one PC, but I think I'm remembering that from another thread. So, just to be sure, you have ONE computer, and that's all, right?
Here are some questions and thoughts:
1. How much data space do your IMPORTANT files take up? If you want everything under MyDocuments or Documents, just tell me the size there.. or think about it.. whatever..
2. If you're talking a handful of Gigabytes at most, then most any USB Thumb drive could be used to back-up your data. If you want a good fast one for a pretty good price, check these out (Obviously, the smaller you go, the cheaper it'll be):
I personally own the 8GB Xporter XT, 32GB Xporter XT, and have used (someone lost it for now) the 64GB Xporter magnum. Overall, the Magnum is the best, I think.. but all of them are GREAT compared to almost everything else out there.. They are fast, durable, and not too expensive.
3. If you have more than a handful of GB of data, I'd go ahead and pick up whatever USB hard drive I could afford, or else a spare internal hard drive.
4. Once you get your media of choice, back-up whatever files are important.
5. Shut down the PC, and make sure whatever backup media you chose is disconnected from the machine.
6. If you were able to burn a copy of UBCD, then boot from that and run Darik's Boot 'n' Nuke - DBAN or Active KillDisk. You can let it run all the way through if you want (will take a very long time), or at least let it run for say 1/3 of the way. If it has completed at least one complete wipe, then you're probably safe. Basically, so long as it's obliterated the file systems on the drive (including the MBR), then you should be good to go, really.. though it wouldn't hurt letting it run a full wipe/session.
7. Now reinstall Windows.
8. Get Windows up to date, and make sure all drivers are up to date.
9. Install your AV software first (I recommend Avira Antivir for free software... or you can get the paid version of that or Nod32 paid version)
10. Install a software firewall - Comodo Internet Security or Online Armor by Tall Emu - all of these mentioned so far are available at
11. THEN reconnect your backed-up media source, and run at least one antivirus/security scan on the files, removing anything that may be infected... or allow the AV software to clean the files if possible.
12. Copy your backed-up data back to the PC.
13. You might then want to wipe the back-up source with a normal format, and then start a regular back-up routine from scratch. One free program that I really like for basic data back-up/sync is SyncBack. You can also try Sync Toy from Microsoft, but I think SyncBack works TONS better than Sync Toy.
Anyway, happy working.
Of course, post back here with further questions, issues.. and/or ESPECIALLY your progress made - whatever you do.
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"If to err is human, then I must be some kind of human!" -Me