I suspect it has something to do with loading guest additions, but there's nothing in the windows Event Log. Have tried reinstalling guest additions but that didn't help. From the VBox logs I see this during a failed start:
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00:00:25.000579 VMMDev: vmmDevHeartbeatFlatlinedTimer: Guest seems to be unresponsive. Last heartbeat received 4 seconds ago
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00:00:25.806271 VMMDev: Guest Additions capability report: (0x0 -> 0x4) seamless: no, hostWindowMapping: no, graphics: yes
Guest: NT4 SP6a
Host: Debian Linux 64