I constantly get windows application error 1709. Can’t run scanner. The tune up doesn’t work. All I get is remove and download again. I have done that several times. Now my computer is locked up.
Can you please NOT post in multiple topics on the same problem.
You stand a much, much greater chance of getting a solution if you put all your posts about the one problem in the one topic, particularly when they are such disparately named topics as;
Re: Can’t install. Why?
After CFW download window installer pops up constantly
Re: Free PC Tune-up from Comodo Experts
Help Spread the Word - Official Comodo banners and logos / bugs in firewall v3
Cheers,
Ewen 
Maybe you dont have system requirement for comodo download.