if i have many windows or programs running, I cannot open anymore



I have windows XP Sp2


The problem i'm experiencing is that I reach a certain point where, if
i have many windows or programs running, I cannot open anymore. As an
example, this happened while I was typing this message and had 7
firefox tabs open, ie open and a few explorer folders open. I was
trying to go into the control panel but couldn't right click or open
anything else once i got in and heard an error sound repeating every
second until i closed the control panel.
The longer I run windows, the less and less windows and programs i'm
able to keep open, to the point where I have to restart in order to be
able to open new programs. It's almost like some cache is not being
cleared and allowing me to start new programs.
As an example of a crash, I once reached the point where I could not
open anymore programs or windows within the programs I was running. I
started opening random programs, all which crashed immediately after
they started to open, and finally got a message from one of them. It
was microsoft outlook and it said 'out of memory'
some times I see in event log enet ID 26: The application failed to
initialize properly (0xc0000142). This error related to all
applications after the windows hung.

I double check computer hardware and all looks fine, when teh problem
is happened I have more when 500MB free memory, CPU working on 2-5%
and hard disk have a lot of free space.
Also I run virus scan with couple of antivirus programs and didn't
find nothing.


Any ideas ?

.



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