Okay so my Vista is the 64 bit version, so internet explorer is 64 bit too. A different browser is like Mozilla or something, right?
Amplid
I know this is an older post, but just in case - there are actually 2 versions of Explorer in Vista x64 (at least in my Ultimate version) - IE7 and IE7(64). The default version in the quick start bar is the 32 bit version, but you can select either version if you go through the menu.