You have the blaster virus.
Please post your hijack this log in the hijack this forum.
Hijack this, is a handy little tool used to survey a system and tell what is currently running on the system. And if a threat is found you can check it and delete it. Althought hijack this doesnt tell you what a threat is or isnt, you can always post your log here and get help.
If you want to download hijack this, it can be found herehttp://www.merijn.org/files/hijackthis.zip