HELP: Lenovo K450 Desktop Wireless LAN Problems?

I recently bought a lenovo k450 desktop, first desktop i have bought, and ever had, ever since i've bought this desktop the Speed.net speeds are 1/2 of the speeds my laptop gives off. My Laptop gives a 54.0 Mbps Speed LAN connection, and my new desktop is giving off 36.0 Mbps , my friend has the same computer, and gets 48.0 Mbps , My desktop is a normal 3.00 Download, and always the same upload on both, 5.80 , my laptop is a normal 6.00-7.00ish download mostly, so if anyone knows how i can fix this i would greatly appreciate that. http://gyazo.com/845451ab21c05605e942081388eb9952 Heres a picture of my current LAN Speed

Hello James,
thank you very much for your help.
I did all the mentioned steps and first it seems that the WLan was working.
It wasn´t as fast as expected, but I could surf in the internet.
After another restart OSX asked me for the password of my router and then I got the old problems: Very very very very slow connection, broken connections and finnaly no connection via WLan.
Do you - or anyone else - have another idea what I can do to fix this f.... problem?
Thanks,
Stefan

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HELP: Lenovo K450 Desktop Wireless LAN Problems?

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