I agree with what zDans saying... if you can connect wirelessly to you orange box from your laptop then you dont need a router. You simply need to setup a connection on each PC.
On each computer go to Start>run and type CMD and press enter.
This will get you a command prompt. In here, type ipconfig and hit enter. Note down your local ip address of your computer (it may be listed as an ipv4 address).
Now in windows explorer go to Tools>Map Network Drive, select any drive letter, and in the lower box, type the following - '\\ipaddress of other pc\root' and tick reconnect at logon, and that should be it.