In Word and Excel 2003, all of a sudden when I use a hyperlink, I get an
error message:

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

I am the administrator, so that is no help.

I have seen this issue mentioned about Office XP and about an upgrade to
internet explore 7 from version 6, but none of that applies here.

I use windows XP, home edition.

Hyperlinks seem to work in Outlook 2003. Although I rarely use
hyperlinks (actually mostly within documents on tables of contents
although external hyperlinks to urls are also not working with the same
error message), they seemed to work okay the last time I used them in
February of 2008.

Any ideas?