I'm having the same problem running the latest version of on Windows Vista. it's been running fine for years, but the recent update, i.e. new icon etc. has caused some issues. I find the security center home window unresponsive and half the time it would just freeze. My internet works fine, in which applications can connect to the internet, but browsing pages seems to have grinded to a halt.
Either wait for an update fix or downgrade I guess. Give us an update on how you get on.
It gets worse. Tech support have told me to uninstall and then reinstall via their website. This website has now totally crashed and I am unable to access it.
It appears that all McAfee websites except this one are down at the moment. Sorry but we are locked out too.