Software Deployment

Hi,
i have a problem with Adobe Reader 9.33 browser integration on a W2003 Terminalserver.
If i try to open a pdf in browser I only get a small icon in the upper right corner. so integration is not working.
I think my silent installation is working fine. Already tried to reinstall browser integration with:
MsiExec.exe /I{AC76BA86-7AD7-1031-7B44-A93000000001} ADDLOCAL=ReaderBrowserIntegration

Any idea what this could be?

Thanks
Carsten