I cannot connect my xbox 360 controllers to my pc

I have a 2 in 1 charge and play while charging power lead but I cannot get my pc to recognise that the controllers are connected. I have followed all the steps on the microsoft and xbox websites, it either takes me to the product page for purchasing a
new controller or I have downloaded a accessories software download. I have chatted with expert xbox gamers through xbox contact page and installed drivers, restarted, re-inserted usb plug, everything. All my sons want to do is play gang beasts together,
using the controllers (as we discovered after buying the game that you cannot play 2 player on a keyboard as they had been doing on a free trial version) they have used their christmas gift money to buy the game and a lead to connect the controllers and I
cannot get them to work! aargghh! #firstworldproblems I know, but if anyone can help, it would be much appreciated. thank you so much

:)