They've put a "nuke" button on IE7 to kill *all* the add-ons and whatever, essentially returning it to as-installed without re-installing (actually if you re-install, it tries to keep all that stuff, bookmarks and so on, for you).
Tools->Internet Options->Advanced->Reset
Rude and crude, but sometimes extraordiary measures are called for (besides if you ever uninstall it, they probably have legitimate worries you might not re-install it).
Needed this to kill some unwanted ask.com crap.. don't *ever* install their stuff. Had to re-install Firefox and wipe out the associated registry and directories. 8-(
They must be paying companies by the number of initially installed copies.. it's bundled along with some freeware and the installation opt-outs vary from misleading to outright lying.
Best regards, Spehro Pefhany