it's just a phreakin virus. usually comes with p()rn

. to remove it just do a system restore to a point just b4 you plugged ur "p-drive" as you call it. my friends had the same problem. if you use anti-virus, only the virus will be removed but the hidden file protection will be still there. so i say, do a system restore and then remove the virus. provided you have the latest update and a good antivirus like avast mcafee or kaspersky.