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Why does CSRSS.EXE overload server and force reboot?

We are experiencing problems with CSRSS.EXE process in Terminal Services. Occasionally it gets hung up (until CPU is 100% used), and there's no way to kill it. We then have to reboot the affected server. Why is it behaving like this? We've got Win2k Advanced Server with Terminal Services SP2.
It's possible that you have the Melare virus. See this McAfee Web page for more information. The virus runs as CSRSS.EXE and can take up 100% of processor cycles. The true CSRSS.EXE is the Win32 subsystem.

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