I had the same problem with all my limited user accounts, and finally found
my solution... Spyware was causing the problem. Seems that if you have
spyware on your computer that may be trying to install something in the
background when your limited user logs on, it creates a log jam, as limited
users aren't authorized to install new software. Therefore, your limited
users can't continue on to the next application, like Internet Explorer or
chat programs. Advice, get SpyBot Search and Destroy. it's free, and will
get rid of your spyware problems. My limited users are back to browsing and
chatting now. You can download it from
http://www.spybot.info/
Hope it helps you.