My first line of attack would be to update your anti-virus definitions and run a full virus scan hither and yon all over your Win2K Server. Despite how we all may feel at times, things don't just "start happening all of a sudden" without another factor having come into play. This sounds like very unusual behaviour indeed, so you should start with an A/V scan and a full round of disk diagnostics. If there are other administrators in your office, ensure that no one else has made any changes, especially to Group Policies, security templates, and the like.
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