I have this problem on various random PCs. User uses CTRL/ALT/DEL to lock
workstation. When they return and try to unlock it the workstation 'hangs'
with a blue screen - not a crash, just a completely blank blue screen.
Workstations are running mostly NW Client 4.90 SP2 or NW4.91 SP1 and Windows
XP SP1. Any ideas?