has an option for Automatic windows updates/ing.
Your pc sounds like it is automatically set to download the updates when you connect to the web.
The Windows updates are vital of XP and recomend them be installed.
Personally I would manually download them.
Look in your Help in windows for Automatic windows updates and it will tell you how to disable the windows updates.
This is most likley the reason your not able to play online games as Windows updates is getting the first play.
Right click My Computer, select properties and Windows updates.
Download the Ie6 and Roll up update last on a second visit.