It would have been handy and more constructive if this could have been kept all in one thread and the answers posted in the one thread - however, as your reply in the other thread doesn't give anyone much to go on I think you are going to struggle.
If services.exe (which is a core Windows process - not part of ARCserve) is eating memory then using perfmon to track usage is almost certainly the way to go, there are plenty of hits on Microsoft's site showing you how to do this and some hits on possible causes, but I guess you already checked this and googled for info on services.exe and memory too ?
Other than that you could check for a service that hangs on starting which might also cause this. You would normally get notification in the event logs of services hanging on startup - oh - and you faulted out the hardware already -right ?