Welcome to BBR - always happy to have more friendly faces.
MSBlast is a worm that exploits a bug in Windows and spreads, but it also (a) implants a backdoor and (b) is not the only code that does so. If your system is not behaving properly, it may be that you have some other bad-ware on your system, perhaps placed by a bad guy.
At this point your best bet is to run antivirus and anti-Trojan software on your system and see if it finds something. For anti-Trojan, I like
BOClean from Privacy Software, but there are others.
It smells to me like your system is still infected.
Good luck.
STeve