You must be sure both machines use the same workgroup name. Also, look at the permissions settings in both machines.
well i'm try to copy files from my xp machine to my win 7 machine i can see the xp machine but i get a message that says "make sure that the xp machine allow incoming connections for file sharing" and i have done just that i think but its a no go i've just about everything.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic