the samba tree is timing out because the password it's asking for is the password on the remote computer. it's trying to connect, but it's getting denied because you didn't type in the correct password and/or username. this is perfectly normal.
a couple of things. first, you don't want to mount your remote computer's shares in the same directory as your local computer's shared files (in your case /mount/samba), so give them a new folder so you won't get your computer or yourself confused as to which computer the files are on:
okay, second ... the "sharename" is what's in brackets [sharename] in your smb.conf files. so in both cases, your sharename is going to be MyFiles.
sudo mkdir /mount/MyFiles
so, your manual mount line for the dell will look like so:
your fstab line for your amd will look like this:
sudo mount -t cifs //AMD-64/MyFiles /media/MyFiles -o user=youramdsigninname,password=********,iocharset= utf8,file_mode=0777,dir_mode=0777
in both cases, you can change "MyFiles" to whatever you like as long as it maches what's in  in the smb.conf of the computer you are trying to connect to. or IOTW, fstab on local must equal smb.conf on remote
sudo mount -t cifs //DELL-UBUNTU/MyFiles /media/MyFiles -o user=yourdellsigninname,password=********,iocharset= utf8,file_mode=0777,dir_mode=0777