Or use a TP Link to avoid the long ethernet and it cannot be because of that because he does not have any problem with the laptop! but the channels are a good shout.
Ah i see laptop bit now. TP link is hit and miss. Depends on the houses wiring and don't run it through a surge protector. I use TP link and it works great for me just take that into consideration. Personally never game on Wireless as Ping is everything
I therefore wouldn't go for a new wireless card. There are many other problems including something with your PC. TP Link is the best shout but research first before wasting your money.