php-win.exe - when to use

All, I'm very frustrated with a batch file I had that was working fine before updating to version 5 of PHP. The batch file was scheduled through 'at' to go off, but after version 5, it doesn't actually execute the php script. It runs fine if I manually call either the batch file or the php script directly from the command line, but not through 'at'. Please, what can I do? The line in the batch file is something like this... c:\php\php.exe c:\phpfiles\phpfile.php Instead of php.exe, I've also tried php-win.exe Thanks for any help! Using Win2K Pro, IIS, PHP5 - Trent