Can Network Browse X360 from vista, can not connect MC or PC Conne

If I browse my network while my XBOX360 is on, I can see it in the network
window
But I can not connect my Vista HP media centre to it or do a PC connect from
the XBOX.

I was borrowing a friends XBOX before and it worked fine and I haven't
changed any settings since.

Getting frustrationg since it wont work with my own XBOX, have checked all
firewall settings and media sharing settings (the xbox wont appear in the
media sharing devices window)

Any other Ideas, I know it's not the equipment as the other XBOX worked.
--
Rgds
Darkside
http://thegamedevspace.spaces.msn.com/