Update Connection Problem

I have a netbook with XP that has Comodo Firewall installed but when I try to update I get an error 108 message to check my Internet connection settings. My server is broadband direct cable - the Firefox and IE internet connection works fine. The connection setting on IE is LAN with automatic detection. I am a non techy, can you give any help. Can I download updates direct from Comodo? I have another HP laptop with Comodo on the same line which updates with no problem. Many thanks for any help offered.