I am attempting to share files between two computers running 11.10. I'm using the built-in samba sharing. When I try to mount the files on another computer it says "Failed to mount Windows share". I have no clue how to get this working. Thank you in advance.
Have a read through the Ubuntu Documentation page for setting up Samba File Server.
It's pretty comprehensive and should give you all the answers you need.
There is no point using Samba to share files between Linux machines! Samba is meant for accessing Windows network shares and services.
Use sshfs instead, there is no setup necessary at all:
sudo apt-get install sshfs
Mount the remote filesystem with
sshfs user@host:/path /local/mount/point
and unmount with
fusermount -u /local/mount/point