printing on IIS7

Hi,
 
I have migrated a php site from Linux to windows. The only remaining problem seems to be printing, naturally I have had to change the code and that's where the problems have started. I have the following very simple code: 

<?php
    
$txt = "Hello World";
$handle = printer_open("DELL3115");
printer_write($handle, $txt);
printer_close($handle);
?>

When I run this from the command prompt using php -f ..... It works fine, in other words it prints, when I run this script through the web browser then I get this:

Fatal error: Out of memory (allocated 262144) (tried to allocate 4294967295 bytes) in C:\inetpub\wwwroot\testprn.php on line 4

I have read this article: http://support.microsoft.com/?kbid=184291 and many others, which all lead me to believe that it is an account / permission problem. On a side note:  $handle = printer_open("non-existing-printer"); gives me a normal error in the sense of "can't find printer".

I run Windows 2008 64 bit, IIS7, php 5.2 32 bit ( I have enabled 32 bit apps in IIS and the rest of the site works fine), using FastCGI.
Has anyone got any ideas?

Thanks, 
Paul Giesberts
IT & QA Manager
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