Invoking WSH from ASP in IIS 6

I have a Windows Host Script written in VBScript that can be called from an ASP page. It works fine on Windows 2000 Server / IIS 5, but when I move it over to Windows 2003 Server / IIS 6 I have problems. In W2k server the VBScript shows up in the task manager as wscript.exe with SYSTEM as its user, but in W2003 Server it shows up as wscript.exe and IWAM_<servername> as the user. In IIS 5, setting the application protection to low enabled the script to be called from asp, but IIS 6 uses application pools. I'd rather not run IIS 6 in IIS5 isolation mode because I don't want to loose any of the security of IIS 6.