Share all the drivers (c/d/e/f etc) in your Desktop computer and make sure you give required permission (Read/write).
Assuming that your desktop computer is hocked-up to the router through LAN (CAT5) then check which port it's connected. ex. LAN port 1 of your router. Then it will get ip eg. 192.168.1.2 or LAN port2 the it will get ip 192.168.1.3.
Best method is make it fixed ip if possible.
Then in your laptop open webbrowser and type above ip address . That's it.
or WINDOWKEY-R (Run command) type \\192.168.1.2 required ip. You will get all the shared file