NIS 2004 computer semi lock up

  Burrawang 23:48 13 Nov 2004

When I'm connected to the Internet, my computer often seems to semi lock up. I cant open some applications or even close Windows XP/SP2 and turn off the computer or disconnect from the net. Sometimes everything clears and all the applications I've tried to open spring onto the screen. If I can disconnect from the net, the computer returns to normal. I'm told this is to do with NIS 2004. I've tried to configure the Firewall but without sucess.
I would be grateful for any help.

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