I installed Comodo Firewall on my Windows XP 32bit and it turned off the Windows Firewall like these softwares usually do. However the Windows Firewall/ICS service is still on Automatic and Started. Is it okay to Disable it or should I expect side effects?
You can but you will no longer be able to share an internet connection on the PC with other PCs on your local network. it is not recommended to disable the service, if Windows Firewall is disabled in Control Panel, this is good enough.