I currently have no further specific questions.
In January 2010 I posted an improvement on the Clean up Tool which I called ZapBeta with 4 stages.
The first stage deleted nothing but identified everything that would be a target and whether it was present.
When I ran that on an installed Comodo it found most targets were present,
and I focussed on the absent targets and found the targets had spelling mistakes copied from the original tool. I reported those errors but never saw any corrections.
Stage 2 attempted to delete each target.
Stage 3 went through the target list and identified everything that was still present and needed to have access restrictions manually dealt with.
I posted this at reply #31 https://forums.comodo.com/install-setup-configuration-help-cis/cleanup-tool-for-comodo-internet-security-old-t36499.30.html
I had complete mastery of removing Comodo 3.? from XP Home.
I could identify what was wrong and get into the registry etc. to fix everything.
If your new tool should be defeated by my computer I plan to attempt alternative measures,
and I just needed all the information that could be given on the feasibility of various approaches to removing stubborn and un-identified remnants.
My Laptop Dual-Boot XP + W7 had a major problem in July 2010, see https://forums.comodo.com/install-setup-configuration-help-cis/v-41-installation-freezes-on-w7-as-it-kills-internet-installing-kernel-drivers-t59655.0.html
I actually suspended my clean up attempts when I found that there are perhaps 50 reparse points in W7 and I could attempt to go through each to :-
create a file;
delete a file;
read a file;
test existence of a file;
The success or failure of an one of those attempts was not related to the other 3 attempts.
e.g. I could possibly write but not read.
I intend to have another go at it, so I am just getting information that may be relevant
Please start a topic in Install / Setup / Configuration Help - CIS. That's the best place and will prevent this topic from diverting from its intended topic.
Try to install CIS and tell us in the new topic what error(s) are being reported in the process.
My Laptop has been "mothballed" since February when I received a far more powerful Desktop,
but I intend to power it up and try the latest version of Comodo.
I will start a new topic as you suggest if I have problems.