I held off on responding after folks started posting how-tos, since you'd previously indicated you weren't confident about ensuring your system was clear.
TW: You're still at square one. If you're not comfortable clearing the system prior to backing up, I stand by my original advice. It is probably better to learn about how to clear a virus and prevent data loss when you are not currently at-risk.
Also, that post and link to the suspect U3/flash drive AV software should be removed. When dealing with such things, it's 'guilty until proven innocent' and I didn't trust that software - even before Bichur posted about it.
As a final comment from me, while I agree image files themselves aren't very high risk for transferring virus and other malware, I think people forget that virus can - and regularly do - intercept operating system calls, especially those having to do with the file and memory subsystems, since this is how virus (aside from email/browser trojans) hijack your system to propogate themselves. In other words, when you do a file copy/move/delete on an infected system you cannot trust that the virus isn't doing other things when you run those commands. I really can't believe some of the advice given in this topic, though I suppose it is easier to give such advice when it's not your own data at risk. Good luck, TW.
