Printer Sharing problems

I have a printer connected to an XP computer and a Windows 7 laptop. I created a local port to my XP computer from my Window 7 laptop (\\XPcomputer\printer). I ran a test print and it worked. When I try to print from a webpage or Word my computer pops up a message saying that I need to select a printer or add one. I try and select the printer that I installed, even though it is already the default, but it won't let me print. The "print" and "apply" buttons as well as the the copies and page range. Please advise.

Thank You.

bump

Yes you are correct. My printer is hooked up on my xp desktop. I have other xp laptops that print fine from the shared printer. I test printed from my W7 laptop and it worked, but that is the only thing i can get to print from that computer.

Instead of getting an error when I try to print I am now getting the document into the print queue. Network Discovery is turned off. Password Protected Sharing - Off. Older encryption is on. What am I looking for in the firewall? Is it strange that I am able to print the test print but nothing else? What about printer spooling vs. printing directly to the printer (in the advanced tab of printer properties)? I have tried both spooling and printing directly. Thanks.

Don't know if this will help but in the print queue screen the top border bar has my printer model but then has a use printer offline (HP Deskjet 5700 Series (HPA) - Use Printer Offline). Is it not detecting my printer?

Well Success...Although I do not know why or how. I did turn encryption down from the recommended 128-bit, but did not do anything else. I restarted both computers but no success. I then uninstalled the printer from the W7 laptop and reinstalled/ re added the printer. It now prints. Thank You for your help. Ahhh the sweet frustration of a windows world!