So we just upgraded to 35 mps upload and download I believe, and the internet is fine on my laptop and other devices. However my desktops about 15 feet from the router, and only gets 7mps download. Why is it so much slower, is it the wireless card or what?
Could be interference by another access point on the same channel. Of the 11 North American channels only 3 do not overlap any others (1, 6, 11). Virtually everything is defaulted to channel 6 which creates an instant conflict with others. Try switching to either channel 1 or 11 and see if things improve.
You may have to diable the wireless adaptor and enable the onboard lan adaptor. Go to the control panel , then network and internet and then network connections and you should see two adaptors one wireless and the other a lan adaptor and you can see if the lan adaptor is enabled or disabled. You can enable the lan adaptor and try it before disableing the wireless adaptor.