Cleaning virus-infected files on external hard drive used for Time Machine

I am kinda reposting this with some extra explanation since I didn't really get any good respnses on my first post:
I am running McAfee VirusScan and it locates and cleans virus infected files just fine on my computer, but when it finds infected files on the external hard drive I use for Time Machine backups, it says "Repair Failed". Is there a way to clean infected files on my Time Machine backup drive?
I had found a virus in several documents on my Mac, which I cleaned, but it seemed to infect a bunch of the files located in Time Machine as well. I know these files shouldn't harm my Mac, but I still don't like having virus infected files. They seem to propagate and I don't want to give them to any of my Windows-using friends.

Hi,
Usually (but not always), virus-infected files aren't system-related, so if they cannot be repaired, there should be an option in VirusScan to delete them or quarantine them instead of repairing them. Assuming that you are archiving Mac-related files and not archives of Windows files, then it should certainly be safe to just have VirusScan delete or quarantine them. An alternative is that you could delete them manually. But before you do any of this, be sure to take a look at the filename and its location in the folder hierarchy to make sure that you aren't removing a file that's critical to the operation of some piece of software.
Hope this helps,
Ken

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