Desktop + Laptop does equal 2 attached devices, or do you mean there are 2 just connected by wireless and there should be only 1?
So I am unsure if the other PC is a hacker, or my desktop
In that list of 2 attached PCs you should see a list of MAC Addresses. If you do "IPCONFIG /all" in a command window on both the Desktop & Laptop you should see the MAC Addresses of their relevant adapters listed as
Physical Address. . . . . . . . . : 00-EE-DD-CC-BB-AA
You should then be able to identify which is which.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU BB => 2010: Orange 16 Meg LLU BB