Installation problem

When I installed comodo firewall today, The installation was successful, everything went normal, after it prompted for a reboot, the system began rebooting, the windows xp logo and the scrolling boot screen was shown and there was nothing more… no blue screen, error message… then I pressed the reset button and entered into safemode by pressing F8 and uninstalled the comodo firewall and then rebooted, now there was no problem, system rebooted successfully, but there was no comodo firewall… then I once again installed it, but the same happened…
Now what to do in order install the comodo firewall and use it…

Regards.