Software Deployment

Hi,

I have a very peculiar issue.

I am trying to run a batch file from wise script.
I used Execute Program

remarked item: Execute Program
Pathname=C:\Hyperion\BIPlus\install\bin\HRRunAnt.cmd
Command Line=>"%WIN%\Software\Logs\originalHyperian_Reporting_Analysis_HRRunAnt.txt"
Flags=00000010
end
The batch script contains %HYPERION_HOME% as environment variable and having value as C:\HYPERION
Batch Script:
for /D %%a in ("%HYPERION_HOME%") do set HYPERION_HOME=%%~fsa
set HYPERION_JRE=%HYPERION_HOME%\common\JRE\Sun\1.5.0
set HYPERION_ANT=%HYPERION_HOME%\common\utilities\Ant\1.6.0



The issue is
Sometimes the environment variable %HYPERION_HOME% is getting resolved to "c:\Hyperion" and sometimes not
the environment variable %HYPERION_HOME% is getting resolved to null i.e. " "
as a result we were not able to install the application.
We are deploying through Altiris
Please let us know how to resolve the issue