Hi,
Is it a brand new laptop running Windows 8.1 or you upgraded it ? All new laptops now should accept WPA-2 key. Your machine should have series code such as dv something. Please use the following way to find out what is its model/product number:
http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&cc=us&docname=c00033108
Regards.