Yes, guest priveleges are correct. When I try to print a test page from either of the networked XP computers, it says "Document failed to print: printer not responding," but it prints just fine on the Vista computer connected to the printer.

Yes, the printer is shared already.

Step one: uninstall Symantec and use a less invasive program, such as Avast (freeware); then enable Windows Firewall

Step two: right click "my computer" on XP, go to properties and rename the network group so it is the same as the Vista machine (default for Vista is "workgroup; " default for XP is "mshome")

Step three: right click the Vista folders you want to share, select "share,"...

I have two PCs running XP Pro, which are networked to a Vista Ultimate PC. The network works fine in both directions, but I am unable to print from the XP machines to my Canon Pixma MX700 printer, which is connected to the Vista PC via a local USB cable. Setting up the networking was problematic, but I finally got it working by setting up guest user accounts on all shared folders on the Vista PC. What do I need to do to network the printer?