It would be my luck to have it not go so smoothly, and I would be like the several other people who have had bad experiences with, for example, incomplete uninstall -- i.e. FUBAR.
Why can't Comodo have a Repair option in the Add/Remove programs item? That seems a much safer approach than full uninstall and install.
(I do appreciate your effort to provide clear instructions.)
There is nothing to fear especially considering that in order to prevent
apocalyptic unluckiness it is possible to manually create a Restore point which in the unlikely event of FUBAR could be even restored from Windows Safe mode.
Anyhow considering I was not able to reproduce on my setup the specific scenario you described so far I guess I'll refrain from providing further advices.