Backing up to another network computer

Everytime i try to use the backup feature to another computer on my network.
It keeps coming back access denied. But I have total access to destination
computer. Anyone else having this problem? And I cant get system restore to
work it has failed everytime. I have a full version of windows vista. Its
like half the features dont even work. About the only good about windows
vista is the visual effects.
zductman