High CPU usage on Win2k Srv

Hello

We have an IBM Netfinity 5000 server (Dual PIII 500 Mhz CPU, 1 GB RAM),
installed with Win2000 Standard Server SP4 and Exchange 2000 Enterprise SP3
with and about 200 mailboxes.
CPU is constantly 50-60%, even when all Exchange, anti-virus, spam and other
services are stopped.
With Process Explorer we found out that "Interrupts" are taking up this CPU
usage, even while System Idle is 98-99%. It is quite strange, becasue
"Interrupts" that can only be seen with this 3rd party utility 'Process
Explorer' are constantly using about 45% of server's CPU.
We tried to restart server, after then CPU was normal, using about max 10%,
but after a few hours it grew back to min 50% and staying at that number.
(again 'Interrupts' went back from 0% to 45-47% of CPU usage).
Does anyone have any solution? Can it be hardware? I was trying to find
solutions also in Exchange forums, but they all agree that this is not
'Exchange related problem'.

Regards
Miha

Here is a tool that you can use to monitor performance on the system to help
isolate the problem:

http://www.microsoft.com/downloads/d...displaylang=en

--
Thank you,

Brennan Crowe
Microsoft Corporation

This posting is provided "AS IS" with no warranties, and confers no rights.

Thanks. I'll try this to see if anything comes up.
Regards
Miha
"Brennan Crowe [MSFT]" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Here is a tool that you can use to monitor performance on the system to
> help
> isolate the problem:
>
> http://www.microsoft.com/downloads/d...displaylang=en
>
> --
> Thank you,
>
> Brennan Crowe
> Microsoft Corporation
>
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>
>