first, try to uninstall malwarebytes.
install spybot s&d and adaware (free). start them and update them (but don't scan).
unplug yr modem after you've updated them both.
boot up in safe mode (for xp-based it can usually be done by hitting the F8 key right after bios loads).
select the setting with limited drivers.
go to C:\Program Files\ and delete the entire folder \Malwarebytes' Anti-Malware folder (if it still exists).
go to C:\documents and settings1\allusers\applications.. and delete \69194130
NOTE: look inside the folder and make sure it's not something you really want to keep. I doubt it, but check just in case.
empty to the recycle bin.
now, run spybot s&d and adaware.
if yr machine is up to it, you can try running both at once, but that can bog you down if the pc can't handle it.
http://www.safer-networking.org/index2.html <- spybot s&d
http://www.lavasoft.com/ <- adaware
take 2 pills and call me in the morning.