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Windows 7: Need to edit registry on non-booting Windows 7 installation

04 Jul 2010   #11

Windows 8.1 Pro x64 x3 + Windows 10 Preview, Ubuntu

As an alternative there is the old shool method

You may have to physically move the HDD to another working system If you do not have a dual boot option on the original system or access to a live CD for the copying stages
  • Boot the other computer with a boot diskette or dual-boot OS and then copy the problem hive file to a removable media or directly across the network to your system.
  • Log in as administrator on your system and run REGEDIT.EXE.
  • In the Registry Editor, select either the HKEY_LOCAL_MACHINE or HKEY_USERS window, and then choose Registry | Load Hive.
  • Locate the file copied to the system in step 1, select the file, and click Open. This loads the hive into the local registry as a subkey of the selected key.
  • Make the necessary changes to the damaged hive and then choose Registry | Unload Hive.
  • Copy the hive file back to its original location on the problem computer. Restart to test the system.

My System SpecsSystem Spec

04 Jul 2010   #12

Windows 7 Ultimate

Thanks for all the replies so far. Heres an update of where I am :

The machine has 2 hard disks - disk 1 (80Gb solid state) which has 2 partitions - 100Mb system reserved and the remaining partition with the original Win 7 installation on it. Disk 2 is a 1.5Tb Serial ATA.

I've installed Windows 7 to the second disk, after doing so disk 1 does not get drive letters assigned. Gone into drive management and I can assign a drive letter to the 100Mb partition but not the larger Win 7 partition.

If I put the Windows 7 DVD in - and ask it to install to the partition on disk 1 originally containing Windows 7 - it says it cannot install to this drive as its an unknown partition type.

Loading the original Windows 7 installation does the same as before - ie in safe mode it will load a pile of drivers and then hang at the message of "Loading \Windows\SysWow64\CTMMount.sys".

The problem originally occurred after installing Comodo Time Machine.

I'm at the stage now where I just need access to this original drive so that I can copy the contents of the Users folder somewhere else - at this point I will be happy to delete and recreate the partition and reinstall Windows 7.

Anyone got any further ideas/suggestions?


My System SpecsSystem Spec
04 Jul 2010   #13
Microsoft MVP

Windows 7 Ultimate 32bit SP1

This 'service' is located here:


COMODO Internet Security"="c:\program files\COMODO\COMODO Internet Security\cfp.exe

I have read that there is an "uninstall" in CTMMOUNT.sys
My System SpecsSystem Spec

04 Jul 2010   #14

Windows 7 Ultimate
Issue resolved

Problem solved!

I ran testdisk - used this to firstly copy the files off the partition that windows couldnt access and then used it to re-write the MBR for that disk.

Disk then appeared correctly in the second windows installation.

Removed ctmmount.sys - rebooted the original windows installation - all works fine!

Thanks for all your help!
My System SpecsSystem Spec
04 Jul 2010   #15
Microsoft MVP

Windows 7 Ultimate 32bit SP1

Thanks for reporting back!
My System SpecsSystem Spec

 Need to edit registry on non-booting Windows 7 installation

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