Comodo Internet Security Encounters Error 1603 After Installation

Dear friends,
I am using windows vista OS on my system.
I installed the comodo internet security on my system a few days ago, but I had to uninstall it for some reason.
Now when I am trying to install it again, I fail because I get the following error on my screen:

The translated error reads as:
"Unable to install Comodo Internet Security, Error 1603. Unrecoverable error during installation"
Can anyone suggest me a reason why is this happening?
I didn’t face any problem the first time I installed it. Can there be a problem with the windows vista registry?
I posted it to many forums and the only solution I got was to reinstall the windows. Any solution other to this is most welcome.
Waiting for your sincere suggestions.
