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 ......

what are the restrictions you added?

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