I Hav Winxp Sp2.i Installed Comodo Firewall 3.when I Ran It An Error Message Came.my Friend Deleted The Comodo Folder(installed Files)in Program Files.now When I Try To Reinstall It Says Older One Has To Be Uninstalled yes or no.when i click on yes there is no response .Also its Not Found In Add/remove Programs List.what To Do?has it to be deleted from registry if yes how???

I am using Comodo and do not have any problems with it. But if you need to uninstall some programs, Windows might not do the job properly.

You might want to try Absolute Uninstaller instead. There are several other programs also, but this one do a good job and is free. At least it has been doing ok for me :-)