Access throught ssh
If you want a terminal access to your laptop, you can use SSH. For that, you need to install ssh server on your laptop and have an ssh client on your Windows machine.
On you laptop, install ssh server (and client)
sudo apt-get install ssh
On your windows machine, you can use a tool like putty.
If you need an access to transfert file, you can use WinSCP. Using the same tool on server side.
Access throught VNC
If you prefer have a remote access to your desktop (more visual), you can use VNC.
In this case, install vino. It is a VNC server.
sudo apt-get install vino
And use a VNC Desktop Remote Viewer like vinagre, or RealVNC on Windows.