Jazz,
I have tried what you propose to enable Security under ENUM, but when I get there via "HKLM\SYSTEM\CurrentControlSet\ENUM", there is no Security Entry to select. If I right-click on ENUM, I get Permissions and can do essentially what you say, but is it a problem that there is no Security Entry under ENUM?
I am running XP-Pro-SP3. If I boot in Safe Mode, then Device Manager shows everything. Any more thoughts
sseirider