I installed Ubuntu (the newest version) onto my Toshiba laptop to replace Windows Vista Premium. However, since installing it I cannot use some website on Mozilla, these include: Facebook, hotmail, wikipedia, ebay and 4od. Either they never load or they load up first time round but cannot be refreshed. I can't seem to find any clear advice anywhere online for this problem, am I the only one to experience it?
The Instant messaging program also refuses to work.

Any advice would be hugely appreciated, thanks