Some feedback from the field:
We've recently deployed Service Pack 1 for Windows 7 to a small group of about 20 PCs as a test.
These consisted of a mixture of a PCs each with either Adobe Reader X, Adobe Reader 9, or Adobe Acrobat Pro v9 installed.
The deployment was done using SCCM and the service pack was deployed as a windows update.
It turns out that the Web Browser integration with Internet Explorer 8 for each of these products was broken by installing the Windows Service Pack.
This means clicking on a link to a PDF in Internet explorer resulted in an error message about the product not being properly installed, and the PDF was not displayed.
Fortunately it was easy to fix, by simply repairing the relevant product involved.
Interesting observation. At least the Acrobat Repair Install fixed the issues.
Thanks for the H/U, and welcome to the forum.
I have had sp 1 installed since it was released. Never had any problems with it such as that. Nor any other for that matter.