Two minor points to make---if I am not mistaken---also in the control panel under modem setting is connect automatically.---and also check to see if your modem speakers are on.
Many dialers will turn them off--and then dial some expensive 900 number---and you won't find out until you get a huge long distance bill.
And as a minor quibble with mechbgon--many of the malware types falling under the definition of dialers will often be better detected by scanners in the spyware class.
Rather than scanners in the antivirus class---which often confine themselves to just viruses--trojans---worms. And if there is a rootkit installed--those will elude detection
by conventional scanners.---so check some rootkit detectors also.
But to the OP hackmole---who wrote--Does anyone have any idea how to stop my dialup connector from popping up all the time. I close it and 10 seconds later it will pop up again? I'm using Windows XP home.
I have one question-----has it always been this way ever since you installed XP home?---or did it suddenly change without you doing anything in the control panel to reset modem settings?---if the latter is true---you better be asking yourself--if I didn't change modem settings---what did?---and if malware got in---you better be increasing your computer security.
Look at the consolidated security links in the software section or find John's links.