Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
I thought I would give you ten reasons why you shouldn't use Ubuntu so when your Ubuntu-loving friends tell you about it you can be armed with some reasons why you would rather use Windows.
1. You Don't Try Before You Buy--We all want to believe all the propoganda from people selling us something we don't need. So why would you want to be able to test-drive an operating system via liveCD before you install it. Tell 'em you don't need any guarantees either, you'll take it as-is, sight unseen.
2. Installation of Software is Too Easy--With Ubuntu you only have to click on the Synaptic and click checkboxes to add software. Then hit Apply. You probably will feel gypped when you have to go searching for software, unzip it, quite everything else you are running, and then install an .exe. Then when you are done run Windows Update (of course only using Internet Explorer) just to make sure everything's up to date.
3. Too Few Viruses/Too much security--