Few comments on the issue
Be wary of AVG as it seems to have a lot of false positives (I haven't experienced them but I have read about them) for example read the following as it is very recent
http://www.tomshardware.com/news/avg...oval,6587.html
Second, having linux live cds can be a life saver, even when I don't need them I use them to back up my harddrive, windows constantly creates errors when I back up my drives before reformatting because a file is currently being read, especially in the my documents folder, however in linux, you can just drag and drop the whole folder and sort out the mess of which files you need and don't need after you reformat.
Best of luck as windows installs gone wrong can be a complete and utter pain to fix.
TB