wifi adaptors necessary ?

Solution
If you can site the PC near enough to the router to use an ethernet cable, that will be a much more reliable connection (slightly faster too) than using wireless. WiFi is rarely used on a desktop PC, that's why most desktop motherboards don't have it. You only use WiFi on equipment that's portable or pocketable, obviously because a wired connection wouldn't be practical or even possible (in the case of a cellphone, for example).
If you can site the PC near enough to the router to use an ethernet cable, that will be a much more reliable connection (slightly faster too) than using wireless. WiFi is rarely used on a desktop PC, that's why most desktop motherboards don't have it. You only use WiFi on equipment that's portable or pocketable, obviously because a wired connection wouldn't be practical or even possible (in the case of a cellphone, for example).
 
Solution