This is a REAL virus. This is NOT a hoax. See: Data Fellows or Snopes.com
DO NOT OPEN "PRETTY PARK." It is a virus that will erase your whole "C" drive. It will come to you in the form of an e-mail from a familiar person.
I repeat DO NOT OPEN. DELETE RIGHT AWAY. I don't know how it gets into your address book, but a "friend" sent it to me. Luckily for me I had not opened it yet. She was not as lucky and now she can't even start her computer!
Forward this to everyone in your address book.
I would rather receive this warning 25 times then not receive it once!