CMD.EXE pop-up when windows startsup help please!

[hugenex]

I have problem with Dos window shows up on Windows start up: "c:/windows/system32/cmd.exe" Here is how it started: after Windows booted up on desktop notepad opened up by itself with a few rows of gibbersh only readable line was "update completed" in between the lines. Now every time i (re)boot dos promt shows up.I used Spybot,Yahoo antispy, Ad-Aware, Norton antivirus. Yahoo Antispy did find "unknown trojan" removed it but problem didn't go away. My system Windows XP pro sp2. Also some strange stuff in my startup.ini: /program/,Fbfxec.exe(4 times). Please Help!

P.S. There is another post about it on this board but no solution.