Hi Mountaintree16,
As far as the run thing goes. Right click on the start orb and select properties.
Then the start menu tab
Then Customize
Then scroll down and you should see an option to display run
I've never used PUI so not sure what to say except that if you look at the faq, if I understood it correctly (and I was skimiming to minimize time,) the main difference is whether you need the visual basic run time files. The full install includes that. As far as #1, #2,#3 go each is just a mirror site for each of the versions in case one of the other sites is unavailable.
I've used RevoUninstaller many many times. I like it. There was a fairly long thread about it
Here
What I'm a little fearful of is that if Add/Remove Programs doesn't see it, then Revo may not either. So from that standpoint, it looks like in the description of PUI about being able to fix entries, that may be the better choice.
Size-wise, both programs aren't that far apart.
I did some Googling for a CIS removal tool and didn't see one. Some people have written a mish mash of manual and semi-automated instructions but I didn't see much coherency.
I have CIS installed on one of my XP machines and it shows up as expected in Add/Remove Programs. I was hoping it might have some funny name but it didn't. Have you looked in the Start -> Programs to see if there is a Comodo group and an uninstall in there?
Another trick that may work is to download a new copy of CIS and try to do a re-install over the top. Sometimes it works and will get back some of the missing settings so you can do a "normal" uninstall. Works better than 50% of the time for me.
Maybe someone else has some more advice. You may have to resign yourself to leaving it as is for tonight. I know you don't want to do that, but sometimes it can't be helped.