Can no longer use links in email messages (legit email, legit links). r

I have NIS 2012, Win XP SP 3 and Outlook 2003.  Up until a few days ago, if I received an email with links - say a track your package link to UPS - I could click on the link in the email and the Firefox would display the page.   Now I get an error box in mail saying " this operation has been cancelled due to restrictions in effect on this computer.  Please contact your system administrator."  

 

I have the NIS add in installed, have not made any setting changes.  These are email messages and links I have sucessfully used previously.

 

Anyone have advice or cure?

 

Thanks!