When such a file is deemed a virus, a cure is sent back to the user. Go online, select the drive or folder to be scanned, and you're clean. But that'll just give you a snapshot in time of your PC's status. Of course, antivirus companies recommend complementing online products with full octane versions of the desktop software. Who invented what fix first and how the products differ are major points of contention in the antivirus industry, and not worth wrestling with here.
Many companies offer some or all of the products above.
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