Original xbox to vista

I have the original xbox, and can't get it to connect with my vista 32 bit
computer. I have it going through my linksys router. It can see my xp
computer and start any movie I have on the xp ..no problem, but if I try to
get it to show my vista it keeps asking for name and password. I don't have
any password enabled on my computer and I have the folder and drive shared,
media sharing is on, password sharing is off...what else is there? Like I
said it see's the xp no problem and they both use the same path(workgroup).
help
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lskinney