If you want to share files between your Ubuntu and Windows computers, your best option is to use Samba file sharing.

Step 1: To install, first open a terminal window and enter the following command:
sudo apt-get install samba smbfs

Step 2 :We’ve got samba installed, but now we’ll need to configure it to make it accessible. Run the following command to open the configuration file, substituting your editor of choice:
sudo gedit /etc/samba/smb.conf

Find this section in the file:
####### Authentication ####### #
“security = user” is always a good idea.
This will require a Unix account # in this server for every user accessing the server.
See # /usr/share/doc/samba-doc/htmldocs/Samba-HOWTO-Collection/ServerType.html # in the samba-doc package for details. ; security = user Uncomment the security line, and add another line to make it look like this:
security = user username map = /etc/samba/smbusers This will set Samba to use the smbusers file for looking up the user list.

Step 3: Create a Samba User
There are two steps to creating a user. First we’ll run the smbpasswd utility to create a samba
-Add user useradd username -password for the user.
sudo smbpasswd -a username

Step 4: Next, we’ll add that username to the smbusers file.
sudo gedit /etc/samba/smbusers Add in the following line, substituting the username with the one you want to give access to. The format is = “”. You can use a different samba user name to map to an ubuntu account, but that’s not really necessary right now. username = username Now you can create samba shares and give access to the users that you listed here.

----------------------

edit /etc/samba/smb.conf add following lins 

[shared]

comment = shared

path = /var/www/

browseable = yes

read only = no