There's a virus email going around, I received it a few weeks ago.
It is supposedly one of your friends on your email list that alleges he/she is "stuck in London" without any money to get back home to the states.
The best thing to do if you get one of those, just don't open it. Delete it!
According to a friend and other sources, it appears to have originated in Nigeria. It seems that a lot of scams and viruses originate from Nigeria. This is just another one.
Just delete it without opening it and you'll be fine.