I can print from my XP machine but no longer on my MacBook, although I could before I loaded Windows 7. I also cannot see any of the shared files and there is no visible computer under the Mac 'Network' icon.
Also, I was tempted to load the x86 drivers as recommended for printer sharing to XP machines but when I check that box in the printer preferences it wants me to find a driver and I don't know where to look.