I don't like (hate almost) Vista but it came preloaded on my PC and I think removing it and installing XP is a backward move. The service pack is supposed to speed things up a little which might help.

Two of the main things I hate about Vista are:
  1. Whenever I want to delete a root folder it says I don't have permission to do this and to consult the systems administrator.
  2. The "My Documents" file system is no longer in My Documents. It's split into directories under the user - Documents, Pictures, Videos, etc. Absolute pain when trying to sync files with my XP laptop.
I have many more gripes but these really annoy me.