If you're doubtful that your computer's anti-virus app has made the right decision about a particular file - perhaps it's reporting Aunty Alice's Christmas family photo as a dangerous Trojan - you can use this site to upload that file alone and have it scanned by several different anti-virus programs. Though there used to be 23 a/v programs here the list is down to nine, which is probably just as well since they run consecutively, not concurrently. The nine engines in use now are:


Avast
AVG
ClamAV
Comodo
Emsisoft
F-Prot
Ikarus
TrendMicro
Zoner

It might go without saying but just in case, remember that your upload speed is going to be considerably less than your download speed - very considerably. So don't expect to upload a 1Gb file and get immediate results, it will take a very long time just getting up there. And then it will pass through nine A/V checks. So be practical. Most suspect files are likely to be very small but even so, allow a few minutes for the engine to get back to you with the results. And don't upload the whole folder if only one file is suspect. You get the idea.

This is most handy when you have to run only one A/V on your computer, because two or more at once will screw the system up, but you're getting a positive result that you're really not sure about. And - ahem - handy for that pirate keygen file that you really, really want, but aren't at all sure whether to open. So I'm told.