Virus file?

[Grishnak01]

1. OS version? Windows XP SP 3
2. What firewalls you have? Comodo
3. How much ram? 256 K (I can hear you laughing)
4. Hard Disk space available? [B****** - 5.17 GB [/b]
5. Connection type? Broadband
6. Modem & router brand name & model numbers? Agere Systems PCI Soft Modem - Model #? umm.. dunno
7. Where are you trying to connect from? Plain ol' house
8. What version of LimeWire (LW) & Java do you have? LW 4.18.8
9. Who is your ISP? AT&T
11. Are you sharing the connection with other computers or p2p sharing programs? No.. none other than LW
14. For those using a modem/router, how is your modem/router set up...are you port forwarding or is UPnP enabled? I'm using a router, but I don't know what you mean by set up. Ummmm.. the normal way?
15. What security programs are you using (antivirus etc)? AVG 8.5.. The free one.
16. What country are you living in? US of A

I thought you might want that info again, so I posted it.

Ok.. I got one of them there 5,611 kb files when I was d/l some music. About 3 songs later, I noticed that LW was telling me that I'd downloaded that file already even though I'd just looked it up. I assumed virus, so I stopped what I was doing and ran my Virus Scanner on the folder. It didn't find anything.
I looked in the folder, but none of the sizes are 5,611.
So.. here I sit.. Fairly certain one of the new files I downloaded is a virus or just crap, but don't know which one.
There a way I can find out which one without scrapping the last 7 downloads?