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For a while now, whenever I run Windows Live Photo Gallery, I constantly get warning messages that Autoprotect has blocked a heuristic virus called "Bloodhound.Exploit.13" (the filename is usually something like "~03_smooth.tmp"). I have run several full system scans which have found nothing. I figured it was a false positive, but I have recently noticed that whenever I use Windows Live Photo Gallery to add a tag or change a caption on a photo, my LZW compressed TIFF images balloon from about 15 MB to over 20 MB. Could this be a virus causing this?