Citrix XenApp Client Install Error – Invalid Drive

Today I went out to a job to fix a problem with installing the Citrix XenApp Web Plugin. The user had downloaded the msi file from Citrix but shortly after starting the installation an following error appeared:

Installation Error – Invalid Drive H:\

Of course, there was no H: drive on the system. I tried downloading the .exe version of the installer, but no luck. Then I did a quick search of the registry and discovered the following registry key:

HKCU\Software\Microsoft\Windows\Current Version\Explorer\User Shell Folders\

The “My Pictures” key was set to “H:\My Pictures”. I changed it to the default for Windows XP which is:

%USERPROFILE%\My Documents\My Pictures

I also changed the type from REG_SZ to REG_EXPAND_SZ. I tried running the Citrix Installer again and voila, it worked! I have no idea why the Citrix installer was tring to access the My Pictures folder but if it works, so be it!