Hi guys, long time no see … I’m back with some news for owners of HP Compaq dc7900 sff machines (obviously) who may experience BSOD under certain conditions (generally during logon phase, or at logon screen).
After experiencing this crash on a dozen of machines and analyzing the minidumps, I figured out that the crash was caused by a nasty service installed on the comps which is called CpqDtct (The CpqDtct.sys file is HP Compaq Client Management Driver). Various attempts to remove the service/file were unsuccessful, and I couldn’t afford to lose any minute (since the issue happened in production environment, during deployment).
Here are the steps taken to disable the nasty little service :
- From a remote computer, access the faulty machine registry through regedit.exe
- Browse to HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\CpqDtct
- Delete all values and subkeys (but not the CpqDtct key itself)
- modify permissions on CpqDtct key to DENY ALL (Permissions / Advanced / Untick Inherit Permissions / Click on Remove / OK / OK)
- Repeat operation with all other ControlSetXXX keys