Need to edit registry on non-booting Windows 7 installation

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  1. Barman58
    Posts : 31,249
    Windows 11 Pro x64 [Latest Release and Release Preview]
       New #11

    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.
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  3. mysterons
    Posts : 5
    Windows 7 Ultimate
    Thread Starter
       New #12

    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?

    Thanks

    Ewan
      My Computer
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  4. Jacee
    Posts : 8,608
    Windows 7 Ultimate 32bit SP1
       New #13

    This 'service' is located here:

    c:\windows\system32\drivers\CTMMOUNT.sys

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
    COMODO Internet Security"="c:\program files\COMODO\COMODO Internet Security\cfp.exe


    I have read that there is an "uninstall" in CTMMOUNT.sys
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  6. mysterons
    Posts : 5
    Windows 7 Ultimate
    Thread Starter
       New #14

    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!
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  7. Jacee
    Posts : 8,608
    Windows 7 Ultimate 32bit SP1
       New #15

    Thanks for reporting back!
      My Computer
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