I have the similar issue in Windows XP Pro SP3.
The script window appeared & went in a flash after install and now ZD won't start. There was nothing in the log directory.
So, I tried to run the command on the command line too see what might be happening and got the following:
Line 72 of the script is where it attempts to launch this file:
C:\Zimbra Desktop\win32>C:\WINDOWS\system32\cscript.exe "C:\Zimbra Desktop\win32
Microsoft (R) Windows Script Host Version 5.7
Copyright (C) Microsoft Corporation. All rights reserved.
C:\Zimbra Desktop\win32\zdrun.vbs(72, 5) (null): This application has failed to
start because the application configuration is incorrect. Reinstalling the appli
cation may fix this problem.
Is this something to do with xulrunner perhaps?
sCmd = Chr(34) & sAppRoot & "\win32\prism\zdclient.exe" & Chr(34)
oShell.Run sCmd, 1, false