I have a Excel 2010 spreadsheet in which I have several links to exchange rate websites. By just clicking on these links I can quickly check the current rate of exchange for a particular currency which I then enter manually. These links usually open the site from Excel without trouble. Recently I've not been able to do this. I get an Excel message telling me, "This operation has been cancelled due to restrictions in effect on the computer. Please contact your system administrator."
I'm not aware of any changes I may have made that would cause this, although I have very recently changed from Firefox to IE9, but I can't imagine that this would cause the problem.
Can anyone offer any help?