In Europe over that last few days since Friday at around 3pm Millions of Computers have been infected by a Virus, it attacks Windows operating systems it started on the Friday12th May. WATCH OUT.
From what I've read? So far it only has been hitting older OS's like XP and ME. Also seems to hit Linux pretty hard also. Supposed to get worse, so back up your important files on Dropbox or an eternal hard drive. Microsoft is working up a patch as we speak.