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I ran into this problem on a Terminal Server configuration where the Adobe Reader X (AcroRd32.exe) process keeps using high if not all cpu capacity even after you close the program. After some searches I found this could be because the welcome screen that is opened when you start Acrobat Reader isn’t closed at all, the session stays active and keeps using a lot of cpu capacity.

Solution:
I could not found a fix for the problem at this time , but there is a workaround that solves the problem. You can disable the welcome screen from starting with a registry key.

1. Open the regedit and navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Acrobat Reader\10.0\FeatureLockDown

2. Add a new key with the name: cWelcomeScreen

3. Add a DWORD value to the key: bShowWelcomeScreen with value 0

Now when starting Adobe Reader it will not start the welcome screen but also does not uses the high cpu.

When using a software package that uses a Transport Driver Interface (TDI) driver you may notice slow network performance. Some antivirus programs like Trend Micro use TDI drivers.

You can download a hotfix for this problem here kb2493361

As some of you may have noticed this issue has happend before but for some reason they don’t put the fix in the SBS 2011 release, so if you have this particular problem install the hotfix.

UPDATE: The update is included with Windows Server 2008 R2 Service Pack 1, so if you do not have installed SP1 run that in stead of just downloading this update.