PDF file indexing stopped working under Windows 8 64Bit after installing Adobe Reader XI

iFilter PDF search stops working on Windows 8 x64

Issue
Windows 8 64 bit provides native support for the PDF iFilter, which enables indexing PDFs so that they can be searched for specific text. Installing Acrobat or Reader 11.0 breaks this feature when it overwrites the Windows 8 native iFilter registry entry with the product registry entry.

How i fixed it:
Restore the registry entry to the Windows 8 native entry as follows:

1. Go to HKEY_CLASSES_ROOT\.pdf\PersistentHandler. Create the key if it does not exist.

2. Verify that the value is 1AA9BF05-9A97-48c1-BA28-D9DCE795E93C. If the Acrobat or Reader install overwrote the entry with F6594A6D-D57F-4EFD-B2C3-DCD9779E382E, return it to its original value.

3.If you have any third-party PDF iFilters installed, reinstall them.

4.Restart the Windows Search service:
   a.Go to Task Manager > Services.
   b.Select WSearch.
   c.Right-click, and then choose Restart.

I found this solution here: http://helpx.adobe.com/acrobat/kb/pdf-search-breaks-110-install.html

Add pdf content to Windows 7 search index

Since Adobe X does not install the iPDF-Filter anymore, i installed the free PDFlib TET PDF IFilter
http://www.pdflib.com/de/download/tet-pdf-ifilter/
on my Windows 7 64 bit machine to let the Windows search also index the content of PDF files and to find them using the Windows Desktop search.
After installation the index options look like this:

After rebuilding the index, also my pdfs appeared in the search results.