Windows Vista Admiistrative account restrictions?

I am now unable to click on links to internet pages or email addresses in emails sent to me. Eg Amazon wanted me to leave a feed back on an item I ordered, I clicked on "leave seller feedback" and the message shows "this operation has been cancelled due to restrictions on this computer. Contact the system administrator ". This is the window that shows each time I try to click on a link. This has only recently happened. I am the administrator as the only user of the lap top. I do not know how or which setting to change. Can any oone guide me please. I have vista.