Itunes won't open - possible virus - how can I backup before OS reinstall

My itunes program, along with my internet connection, Outlook, and several other system programs, is not working. One day the computer just wouldn't let me open this set of programs, and since I can't go online I can't download the itunes program again to deauthorize the computer before we wipe it clean, nor to do a backup.
I can turn the computer on, however, and see the itunes data in the app data folder. Is there any way I can do a backup without actually getting into the program? I have a backup from several months ago but not a recent one and hate the idea of loosing music that we've recently purchased.
Thanks for any advice you can offer.

+see the itunes data in the app data folder+
The major folder used by itunes is the c:/...music/itunes folder and all its subfolders. That is the one you should try to back up.
http://support.apple.com/kb/ht3847

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