I looked into some forums for help and started the process of trying to get rid of the nasty bugger.
After having fixed a few things with Hijack This I set my computer to reboot into safe mode by changing the configuration in msconfig.
When I rebooted my computer it does no longer accept my username or password! I only have a guest account set up on my computer (don't know why, that's the way it was set up when I got it from the previous owner). I have no clue what to do, I have tried to start the computer in some other kind of mode but I can't get through the password prompt. Also, my CD-reader does not seem to work after that I got the smitfraud.c infection. This probably means that I can't reinstall Windows either, right?
The biggest problem of all is that I have an almost finished assignment (relatively big assignment) saved on my laptop that is to be handed in tomorrow. I have no idea how to get that file.
Anyone that thinks he can help me is greatly appreciated.