I have a Dimension 4600 and my limited users in the couple of weeks have been unsuccessful in executing internet explorer.  I've tried to recreate accounts, and reloaded XP both unsuccessfully.  I did change one of them from "limited" to "administrator" and they were able to get IE up and access the internet.  Once I changed it back they could no longer do either.  I've attempted to get the Dell support folks but they have been unable to figure it out.  Help!