cgi error when instantiating a com application

Hi All, If anyone could shed light on this I would be well appreciative. Under IIS 5.1, XP Pro, PHP 4.3.0 and PHP 4.3.1 whenever I instantiate a com object ie: $myobj = new com ("ixsso.query") or die ("blah..") I get a windows error message, although the script does execute up until the com object call. If I call an invalid object ie ("muppet.fraggle") then I'll get my correct die message and no error. If I don't have any script before the new com call then I'll get a CGI error "The specified CGI application misbehaved by not returning a complete set of HTTP headers. The headers it did return are:" AppName: php.exe AppVer: 4.3.1.1 ModName: php4ts.dll ModVer: 4.3.1.1 Offset: 00030727 I've tried installing Apache 2 and retesting, I get the same result. Anyone else struck this problem ? Resolutions ? Kind Regards, Rowan