Problems reaching certain websites from one user account

[Simon70]

I am having problems reaching certain websites with my sons user account. The issue only appears to effect Facebook, Twitter, Google and Microsoft Family Safety. If I log in using my own account everything works fine.

A couple of notes to help -

• The issue is present no matter which browser i use.
• Even the using Google as the default search engine does not work. Bing & Yahoo work fine.
• The PC runs Windows 8.1 64 Bit
• I am on Virgin Broadband in the UK
• The PC connects to the router via a network switch as do other PC's in the house.
• Malware Bytes returns no results
• Bitdefender anti virus returns no results

Thanks in advance for any help that you can give.

[mixture]

First and most obvious port of call would be to turn Microsoft Family Safety off and see what happens.