Obviously you can connect to the internet otherwise, as you have posted here, (unless you are using another PC).
But do you have a firewall installed? If you had to re-install the firewall after re-installing your OS, it may not be configured to allow P2P access.
My comp recently crashed, got it all reloaded, but my Ishareit file shareing site downloads but will not connect back to the internet. I added a 2 spyware protectors and an addware guard, also some graffics on some sites will not download, like chat windows..
Is it something with my security settings or ???