I am running win2k with SP2 and Arcserve 2000 SP4. I have seen the Arcserve manager disappear without any message- it's there one minute, gone the next. I can open the manager again, and all the jobs are still running. Now the situation is worse. Half an hour into the backup job, the whole server locks up and has to be hard rebooted. The arcserve manager has the jobs listed as active in the job status, but the tape drive is obviously idle and the jobs cannot be stopped or deleted. Arcserve is the only application running when the crashes occur and if the backup does not run, the server does not crash. I do not have the agent for open files installed, I don't own it. Any ideas?