Stuff that doesn’t make it to my Windows machines (or that shouldn’t be there):
Anything Apple-related, like Quicktime, iTunes, Safari. Apple installs unwanted software along with them (iPod services, iPhone services, updaters) that I did not give them permission for installing. In addition, Apple’s Windows software is horrible.
OpenOffice.org. The only reason I use OOo is because there’s no decent alternative on Linux. Preferably, I’d personally light the fire in which we burn OOo. What a horrible office suite.
Internet Explorer. Apart form the standards issue, this browser has the world’s worst interface. Seriously, I don’t understand how any programmer or designer can look at IE’s interface and say “Yeah, this looks pretty good”. Please, take it ’round back and take it out of its misery.
Any IM application other than Miranda IM. Miranda is how IM should be: barely uses any system resources, extremely fast, very configurable, and most importantly: completely unobtrusive. It’s probably a little too feature-packed for most ordinary users, though.
Any third-party driver/hardware configuration tool, such as those that come with wireless dongles, printers, or scanners. They have horrid interfaces, interfere with Windows Vista/7’s capable and well-designed default tools, and suck up system resources for no apparent reason.
Virus scanners. UAC+WinPatrol+anti-spyware application, all you need.
Opera. I can’t say it’s a “browser” with a straight face. Classic case of biting off more than you can chew. Opera, ditch all the useless crap, and just release a browser for once. Oh, and stop your pathetic whining to the EU about IE. Even without IE being bundled Firefox, Chrome, and Safari would still be better than you.
Just a selection.