Did you ever get the dreaded error Error 25028.The Application Virtualization Client service could not be configured from the App-V installer? It should be effective enough to perform a manual cleanup according to the previously blog-post article by Microsoft, however there are some minor steps that eases the process in addition to what has been communicated.
A summary of steps according below;
Execute the following commands to remove the services;
sc delete sftvsa
sc delete sftlist
sc delete sftplay
sc delete sftfs
sc delete sftvol
Delete the following folders;
C:\ProgramData\Microsoft\Application Virtualization Client
c:\program files (x86)\microsoft application virtualization
%public%\documents\softgrid client
%appdata%\softgrid client
%localappdata%\softgrid client
For an App-V 4.6 SP2 client, you need to remove this registry entry;
HKEY_CLASSES_ROOT\Installer\Products\C38408D5792D40E4E9FDDD8525E15956
It may be different for an App-V 4.6 SP1 client, but you can easily find it by searching for “Virtualization”.
Reboot the client and the installation should run cleanly afterwards.