Application error

I just tried installing and running COMODO Firewall Pro XP(free).

One major problem:

Once it was installed, I could not call up any instance of iexplore.
Any double-click of a link, including to Google, and Windows XP Pro would
respond only with a message box which read:
Application Error: iexplore.exe

After installation, COMODO Firewall would begin its anti-virus check, then
would ask me to restart my PC. I did.

Even after a restart, I was unable to use iexplore. The same application error message appeared.

COMODO looks like a nice piece of software.

Can anyone help me with this iexplore error?