I use a lot of different machines. I found it to be a common trait, regardless if it was a factory install or someone had installed it themselves.
I can see how you'd get the odd pause if you had a lower end machine like mine (see 5 posts up) - and let vista run with default settings. Windows defender, system restore, indexing etc will all happily bog a system down. Oh, and pre SP1 systems will be even more prone to it. Mine runs just fine and its a pretty mediocre system tbh.
Many non-power users or people who've never used a different OS won't even be aware of any of this though, they'll just see it as the way things are. In fact they'll probably go and install another 3 "security" applications on top. Naive is the word....
