Are these 64 bit clients?
There are 2 paths for "CommonFilesDir" on a 64 bit system for mapping these locations for appropriately for 32 bit & 64 bit applications
One is HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion it should be "C:\Program Files\Common Files"
The Second is: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\windows\currentversion\ and it should be "C:\program files (x86)\common files"
Hope this helps,
Cheers,
Aniket