Unable to Fork error using exec() or system()

I am using IIS6 and PHP 4.3.2-RC. Any time I try to use the exec() or system() functions to run an external program, I get the "Unable to Fork" error. I have execute rights on the applicaiton I am trying to run. The problem is PHP prepends "cmd.exe /c" to any exec() or system() calls. That means I need to give cmd.exe execute rights for the anonymous web user account. This opens up a HUGE security breach, and I was wondering if there are any plans to stop PHP from prepending that or workarounds for the Unable to Fork error. I know many people must run into this problem, there has to be a way around it! Thanks, Dave