Slow Wifi on Desktop but fast on Laptop

[forge153]

Having problems with my slow WiFi card on my desktop compared to my Macbook pro retina.
Macbook Pro Retina wifi speed: 10 Mbps
Desktop: Asus PCEN15 (http://www.asus.com/Networks/Wireless_Adapters/PCEN15/) : 1.8 Mbps

Is there a solution to this problem? Or do I just have to go buy a new WiFi card for my desktop (recommendation on WiFi cards please).

Router = http://www.asus.com.au/Networks/ADSL_Modem_Routers/DSLN55U_Annex_A/

 

[silentplanner]

yes you will have to buy new WLAN adapter usb adapter is recommended.