HELP w/InstallShield

[Too_Tall_Crown_Victoria]

I need help.

Our installs use InstallShield 6.3. Before this week we were running VBP 4.6b with no problems. I just upgraded VBP to 5.1 and now I cannot get the InstallShield step to work at all. I keep getting:

Failed to create process: The system cannot find the file specified.

Even though nothing has changed in the script. I have verified the paths and everything seems to be fine. I already have a batch file that compile the app, and the InstallShield step was just building the media.

Why does this not work anymore???

Thanks to anyone with ideas!!

Tom