NIS installed on iMac OS X 10.10.1 but unable to carry out first scan and update.

Hi All,

First post. NIS seems to be installed OK - ran 1st scan and rec'd msg "Computer at Risk" but couldn't do anything else including downloading updates.

Internet and Network checks show I am connected to wifi and Chrome browser works but not Safari, iTunes, Google Earth.

Have used "assist me" which shows evrything OK until "cannot connect to internet".

Have cleared history in Safari, checked for proxies, add-ons, etc. Everything fine until the NIS download/install