Hyperlinks in MS Office

Hi folkes,

Not sure if this is an Office issue or a Win XP issue, but thought I'd try here first.

I have just installed SP3 for Win XP, and all went well with no apparant issues. However, I have just discovered that all hyperlinks in Office documents are now disabled. Clicking on a hyperlink in Word; Excel etc results in the message:

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

Links worked fine before installation of SP3, so I am assuming this is the cause. Presumably it has tweaked a security setting in Office, and I am hoping that one of the gurus here may be able to advise.

TIA,

Cliff