Hi, whenever I click on a hyperlink in an e-mail or any other document I get a message which says:"This operation has been cancelled due to restrictions on this computer. Please contact your sustem administrator." I am the only person who uses the computer and have all the admin rights. This has only happened in the last couple of days and for no apparent reason. I haven't installed anything to cause this to happen. I have done a system restore but this hasn't done anything. Anyone got any ideas? I am running Vista Ultimate on a Quad core 2.66GHz pc.