But, just for clarification, I assume you still have the original printer connected direct to the Desktop via a USB cable?
If so you can also still access it from the Laptop via the Windows network system as per the previous posts that attempted to explain the method to achieve this! i.e. it does not matter that it is not wireless connected, the Windows can still access it remotely from the Laptop!
So now you could have the TWO printers that both computers could access over the network!