Thanx heaps for your reply.

Ok so its working for you in your installation of Windows 7. Well thats good to know. I'll have a bit of a play then and I might also try a fresh install of Win 7. Anything I've tried so far hasn't reaped any results. Ive reinstalled Comodo 3.10 several times, and have not changed any settings. The thing I find the most weird is the way Windows Installer comes up to reconfigure Messenger, the first time I run it, after having either installed or uninstalled Comodo.
Although as small as a problem this might seem, I was concerned that Comodo maybe affecting the compatibility mode of Windows 7 in general, meaning that it may affect other programs that I may use that rely on this feature, although at this stage I have very little.
Im running firewall at a Custom level and Defence Plus at Clean PC mode. Do you have any suggestions as to what settings I could try? Are you running 64bit or 32bit. I'm uing 64bit.