Disable Hyperlink Warning in Excel 2010

Hi,

I'm opeing some .pdf files throught hyperlink in Excel 2010. but every time, it pops up this annoying hyperlink warning:

"Some files can contain viruses or otherwise be harmful to your computer.

It is important to be certain that this file comes from a trustworthy source.

Would you like to open this file?"

yes Cancel "

I've add the location of my server in Trusted Zone, Disable macro warnings and enable every add in but all in vain.

Any solution ? I'm really fed up now bcoz yesterday it was working fine but now

here??
http://support.microsoft.com/kb/925757

I ve already try this tip but no way. Still having same messages.

It was working fine but when I've applied some restriction on this folder then i am getting these warnings. I've full access on folder of this file and remaing user have read only but they are not getting this warning.

-Excel Options
--Trust Center
---Trust Center Setting
----External Contents
-----Security Settings ( Data & External Links )

-trusted location --allow trusted locations..

turn all option in Document Inspector off.

I've done it already. Even I have add this location in trusted location as well but unable to stop these warning messages. I've enable all external links, Active X, add ins but ......

http://support.microsoft.com/kb/829072
i think this link is the solution...its not "inside excel" that's triggering the warning message.

what are the restrictions you added?