I have a LAN comprised of two Win7 Ultimate 64bit (sp1) PC's and one or more XP PC's. They have been able to share files between them pretty well for many months, but with the latest Win7 updates, the XP PC is no longer able to access the Win7 shared files. They, however, have full access to the XP shared files, it's purely one way! I checked the net configuration parameters that permitted the original sharing to function and I see no changes (no password protection, same number of encryption bits, Win managed). However, when trying to access the Win7 files from XP, I'm now always told I don't have permission! All PC's are visible from each other. Is there a solution to this nonsense? Did MS deliberately break LAN file sharing with XP? I don't know if XPsp3 also doesn't work anymore, but XPsp2 is in the dark (sp3 incompatible PC). Thanks for any help!