I have a lot of documents with hyperlinks to websites. All was fine until recently when the hyperlinks stopped working, the message displayed states:-

"The operation on this computer has been cancelled due to restrictions in effect on this computer. Please contact your system administrator."

As far as I know I have not altered anything on the computer or in Word to cause this. The only change recently was changing my Anti-virus to Microsoft Essentials.

How do I correct this please?