Insufficient system resources exist

Hi

Im experiencing some problems on some of my user machines in my 2003 domain.
When they try to save their work from the appliaction that they are running
(mostly a 3d CAD program called Solidworks 2007), they get an error message
saying

Z:\ is not accessible
Insufficient system resources exist to complete the requested service.

There are enough memory free in the machine so it doesnt seem to be a
problem there...

If you try to open explorer and access any mapped drive you get the same
message... Closing down other applications such as outlook MIGHT give the
machine enough power to access the mapped drive again and thus save the work.

I have tried finding an answer to our problem but i havent found anything
that have helped so far...

The users are working with a 2003 SP1 standard server.
Using Trend Micro 3.6 SMB if that is of any relevance...
Winxp sp2 machines fully updated.

I would grately appreciate any suggestions on this matter.

Best Regards
Per-Olof Olsson

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Per-Olof Olsson
IT - Manager