Bonjour not working in 64-bit OS's (Windows)

I am writing an app that finds all the printers on a network so I can install the correct printer. I can do this fine in any Windows 32-bit OS (XP-Windows 7rc). However, when I try in any 64-bit OS it does not work. My call to DNSServiceBrowse() returns BadParam. I do the generic call:
err = DNSServiceBrowse( &client,
0,
0,
"printer.tcp.",
NULL,
browseReply,
NULL );
client is declared as:
static DNSServiceRef client = NULL;
If I compile the mDNSResponder.exe provided by developer.apple.com it works fine. Also, dns-sd.exe allows me to browse for the printers on the network. So what is wrong with my call? Why does it work in 32-bit and nto 64? Do you have to define client differently in 64-bit?
Thanks for the help.
(NOTE: I DO have the 64-bit version of Bonjour installed on the OS).
Message was edited by: RJBez

64 bit bonjour works on my Vista x64 without a problem. I had to make sure Bonjour services were started in services manager. I had to set Bonjour to Automatic load and start.

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