Drive letters not assigning to DVDROM or external drives on notebook

hillsdave said:

ok, both usb & dvd working in safe mode, still had to assign drive letters manually though.

And usb & dvd still have drive letters now in normal boot? Can you change the drive letters now as well? If not... are the reverted back to previous drive letters?

hillsdave said:

No, in normal boot problem still exists

So you were able to make it work in safe mode. usb and dvd has drive letters then. After that you did reboot normally. Drive letters were gone then? Reboot to safe mode... still gone?

Second test: Boot to safe mode and give usb and dvd a drive letter. Reboot again to safe mode. Drive letters are still active and working?

In safe mode (after assigning drive letters succesfully) enter "command prompt":

Code:

reg  export  HKLM\SYSTEM\MountedDevices  d:\safeboot.reg

In normal boot mode enter "command prompt":

Code:

reg  export  HKLM\SYSTEM\MountedDevices  d:\normalboot.reg

Post d:\safeboot.reg and d:\normalboot.reg. You may delete the 2 files afterwards.

hillsdave said:

Kaktussoft said:

hillsdave said:

No, in normal boot problem still exists

So you were able to make it work in safe mode. usb and dvd has drive letters then. After that you did reboot normally. Drive letters were gone then? Reboot to safe mode... still gone?

second test: Boot to safe mode and give usb and dvd a drive letter. reboot again to safe mode. drive letters are still active and working?

1. Assigned in safe mode, working. Rebooted in normal mode, drive letters gone, rb in safe mode, still gone.

2. Assigned in safe mode, working. rb in safe mode, still working.

Boot normal boot and safe mode use registry key HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices for drive letters. Something in normal boot removes them?! So win7 can read/write/delete to that key.

You logged in as same user in safe mode an normal mode?

It looks like something is monitoring registry key HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices and does nasty trick.

Try a clean startup Troubleshoot Application Conflicts by Performing a Clean Startup same problem?