Take a look here
http://www.google.com/search?hl=en&q...stall+problems
"sp4help" <> wrote in message
news:0D507FC3-8FC0-4FDF-AC19-...
>I just installed windows 2000 sp1 onto an old computer of mine and I was
> trying to update my service packages. First error was that the 'scan for
> updates' did not work on windowsupdate.microsft.com. So I downloaded the
> network install SP4 package from MSFT's website and I keep getting this
> strange error saying that service pack 4 cannot be installed because
> comrepl.dll is being used or accessed by another application. The problem
> is
> that I closed down all my applications!!
>
> Help!!! I have tried reseting the computer, redownloading the package,
> etc.
> but nothing has worked!