Can't print from PC notebook through Airport Express

Question

I am using a Sony Vaio notebook running Windows XP. I just purchased an Airport Express along with a PowerBook G4 and have my HP DeskJet 5650 connected through the Airport Express. My PowerBook is having no trouble communicating with the printer, but my PC notebook cannot "find" the printer. In talking to Apple Support on this issue, I was told to download Bonjour for Windows, which I did. Once Bonjour was installed, I was still unable to "find" the printer and, additionally, I began receiving an error message stating "The application has failed to start because dnssd.dll was not found." I reinstalled Bonjour to be safe, but the problem continued. Apple Support then suggested I set up an IP print share as an alternative solution, but that ultimately failed to work because my specific HP printer model is not listed. Strangely, and maybe the bigger issue as I attempted to set up the IP print share, when I entered my IP address as 10.0.1.1 which named the port IP_10.0.1.1, it told me the port name was already in use and wouldn't let me continue.
I'm confused and frustrated. Apple Support was as helpful as they could be, but have thrown in the towel and deemed this problem outside the scope of their support.
Can anyone please help?

Answer 1

Thanks, iFelix...
Unfortunately, I've tried all three methods and am still not able to bring my printer onboard.
Using the first method above, first of all, when I attempt to create a new TCP/IP port and enter 10.0.1.1 as the IP address, which then turns the port name into IP_10.0.1.1, I receive a message that the port name is already in use. When I attempt to go with "Use the following port:" and select the IP_10.0.1.1 port, I am unable to locate my printer on the list. When I attempted to get around that by using the third method above, it allowed me to go through the process having chosen another HP DeskJet "stand-in" printer, but when it came to the end of the process and I asked it to print a test page, it failed to work. I even attempted to get around the issue by selecting the "Have Disk" option in the printer window, put my printer driver disk in, and was still unable to get it to recognize my printer.
With method number two, Bonjour continues to not be able to sense my printer.
In case I didn't make this clear earlier, this PC notebook has never had any problem printing to the printer when it was connected directly by USB, the problem is only now a result of having connected the printer to the Airport Express.
If you have any other advice or suggestions, I'd appreciate it more than you can imagine.