Problems deinstalling and reinstalling CIS

Hello. I am having a problem with deinstalling CIS V7 so I can install CIS V8. I attempted to deinstall V7 thru the Add/Remove programs entry. I am running Windows 7 X64 Home Edition. Halfway thru the deinstallation process mu computer suffered a BSOD! After I regained control of my computer I restored my machine from the last Restore Point in order to restore my internet connectivity. I then removed all COMODO-related directories form my machine. Then I started regedit in safe mode and as Adminitrator to remove all possible CIS-related keys. The following four keys, however, I could not remove: HKEY_LOCAL_MACHINE\Software\Comodo; HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\CmdAgent; HKEY_LOCAL_MACHINE\SYSTEM\CControlSet002\Services\CmdAgent; HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\CmdAgent; HKEY_LOCAL_MACHINE\System\Software\COMODO. When I attempted to remove these keys regedit complained about errors in deleting keys due to unspecified errors. I did find out that I could remove the data within the keys and rename them.
However, before I attempt to install CIS V8 I need to know the answers to the following questions: (1) Will these renamed corrupt keys prevent CIS V8 from being installed? (2) If these renamed keys will prevent CIS V8 from being installed, How do I manipulate the registry to remove these keys without further damaging my PC to the point of a rebuild of my computer OR avoid taking the computer to the Geek Squad? (3) How can I help you “harden” the deinstallation procedure so this kind of BSOD never occurs?

Thank you for your help.

Addendum: After reading some of the other topics on this help forum I manged to get CIS V8 to install on my PC. However I still need to know the answers to the two remaining questions (2) How does one remove from the Registry corrupted keys without reinstalling Windows 7 or going to the Geek Squad (3) How does one prevent a deinstall of CIS from causing a BSOD?

hi Jrswenson

Any chance you can tell me what you have done to get it to install? I am having simlar issues :confused:

Legacy Keys are a pain to remove because of permission issues. To remove the socalled Legacy Keys, which are otherwise hard to remove, open Device Manager from the command prompt using the following two commands:
set devmgr_show_nonpresent_devices=1
start devmgmt.msc

Set Device Manager to show hidden devices under menu option View. Then see if there are Comodo Internet Security related drivers left in non Plug and Play drivers. If so select the driver → click right → uninstall. Do this for all present CIS drivers. Do a reboot when it has been requested.

Please try reinstalling CIS following Most Effective Way to Reinstall CIS to Avoid/Fix Problems by my colleague Chiron. It will provide a reliable clean starting point.