I checked your past solution to this problem. Here are the facts:
. When I click on a PDF link, a new window appears as a blank. The error message either says :Invalid object" or "Expected Object Missing"
. I am running I.E. 7.0
. I lowered the security level to Medium
. I have Norton Security 2006 installed. The problem happens even with Norton disabled.
. I am running Adobe Acrobat 5.0 (full version). I have tried reinstalling Acrobat and that did not help.