If you opened it, changes are that you got a worm, but not a trojan? If you ran an .exe file ( which you did not do ) you most likely got a trojan.
I'd recommend you to run a full scan with updated
SUPERAntispyware, pluss your own antivirus ( if you have one!)
Remember for SAS: Update until it says; No updates needed.
That is very importaint!
Also, as you probably know, you could always post a hjt log in the Hjt forums
But in my opinion: Calm down, I don't think you are infected (Prank-email?).
But rather safe than sorry: Do a scan!
Happy holidays!
