Winpcap 4.1.2 and NMap 5.0

All of a sudden Winpcap 4.1.2 and NMap 5.0 have been installed on my computer. I have Windows Vista. Use Internet Explorer 8 and/or Firefox 10.0. have McAfee Security-as-a-Service through Dell (IYogi) as well as AVG. I never download new programs. Programs on my computer have been there since factory installation. About two weeks ago (give or take a few days) these other two programs showed up out of nowhere. I did a manual uninstall through the control panel/programs, but upon restart, they reinstalled. Dell (IYogi) tried twice over the phone to uninstall...same thing. They said there wasn't any threat the programs are a nuisance more than anything else (whatever that means). I have firewalls and have run constant scans, but nothing questionable shows up. Even tried Revo Uninstaller Program to do a forced uninstall, but nothing. Can anyone help????? Are these programs dangerous? How can they be permanently uninstalled? How did they even get on my computer to begin with????? :(

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