Perl with IIS - Handler Mappings

Hi, trying to set up Perl CGI with IIS 7.0 on Windows Vista, I installed ActivePerl and tried to set up a handler mapping thusly:
Add script map, request path => *.pl, executable => C:/perl/bin/perl.exe

And I get a 502.2:

Server Error in Application "Default Web Site"

HTTP Error 502.2 - Bad Gateway

[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif] [/FONT][FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]Description: The specified CGI application did not return a complete set of HTTP headers. [/FONT]
[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]Error Code: 0x00000000 [/FONT]
[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]Notification: ExecuteRequestHandler [/FONT]
[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]Module: CgiModule [/FONT]
[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]Requested URL: http://localhost:80/Helloworld.pl [/FONT]
[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]Physical Path: C:\inetpub\wwwroot\Helloworld.pl [/FONT]
[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]Logon User: Anonymous [/FONT]
[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]Logon Method: Anonymous [/FONT]
[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]Handler: Perl CGI [/FONT]
[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]Most likely causes: [/FONT]

• [FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]
• The CGI process was shut down or terminated unexpectedly before it finished processing the request.
• The CGI process has a flaw and does not return a complete set of HTTP headers. [/FONT]

[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]What you can try: [/FONT]

• [FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]
• Check the event logs on the system to see whether the CGI process is shutting down unexpectedly.
• Troubleshoot the CGI application to determine why it is not sending a complete set of HTTP headers. [/FONT]

[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif] [/FONT][FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]More Information... This error occurs when the CGI process handling the request exits before it finishes sending the response to IIS. [/FONT]
[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]Server Version Information: Internet Information Services 7.0.

I am not sure if this is the correct file to be calling, but I didn't see a special perlcgi.exe - any ideas?
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