Help setting up file sharing?

I have build 7000 installed and cannot get it to share files with any of my other computers running Vista.

I can see both in the network tab but if I try to access it from my Vista machine it says" Logon failure: the user has

not been granted the requested logon type at this computer." The network map shows a dashed line between the

router and Win7 machine, and solid line between the router and Vista machine, I also have XP on a laptop I will be

sharing at a later date.

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