Comodo has blocked my internet connection. Help

I was using comodo firewall for the past one month and it was working fine on my Vista Home Prm. But Yesterday i uninstall Comodo as i suspected some problem in it and reinstall it and restarted my pc. but to my surprise my net was not working, even i could find reinstalled comodo on my pc. when i try to install it again i was prompted that it is already installed in my pc. I couldt find a single file on my pc relating to commodo. plz help. I am unable to connet to my server for internet.