Yall be careful when swapping USB drives from one Windows machine to another.
Another Windows bug is being exploited out there:
http://www.h-online.com/security/news/item/lnk-vulnerability-in-Windows-Attack-wave-approaches-1044370.html
http://www.pcmag.com/article2/0,2817,2366651,00.asp
Or you can just google lnk bug or lnk virus. ( thats a small L, not a capital i, as in link without the i)
Be sure to keep the security software up to date!