Greetings Kurt,
Given the nature of the problem and the fact it affects multiple applications, this probably
either a problem with a specific driver or some sort of hardware problem (like overheating).
For instance, I had a faulty network driver once that would halt the PC when specific strings
of data were sent through the network -- a driver update fixed that. You may want to check
Dell's site and/or Windows Update to make sure you have the latest drivers.
You can also check the temperatures in your PC by using something like Speedfan:
http://www.almico.com/speedfan.php
--
Jonathan Kay
Microsoft MVP - Windows Live Messenger
MSN Messenger/Windows Messenger
MessengerGeek Blog:
http://www.messengergeek.com
Messenger Resources:
http://messenger.jonathankay.com
(c) 2008 Jonathan Kay - If redistributing, you must include this signature or citation
--
"Kurt" <> wrote in message
news

AE8F365-73E9-444C-A8FD-...
> Hello,
>
> I have a Dell Dimension 8400 running Windows XP SP2 and Windows Live
> Messenger 8.5.
>
> At least once or twice a day when an instant message is received in WLM the
> computer hard locks (keyboard frozen, Num Lock key won't toggle etc.).
>
> This probably started a few months ago and unfortunately I can't think of a
> system change that may have started this.
>
> Interestingly, if I run Trillian 3.1 the same locks ups occur.
>
> Thanks,
>
> Kurt