Some laptops whitelist cards so you can't just buy such and expect it to work.
Also, it sounds like this is not an upgrade but a repair job.
I have an Asus laptop it has a intel N-6150 + wimax wireless card. it has seemed to disappear from the device manager, and after reading a lot of past posts ,I am deciding to change the card entirely. Which wireless card should i use that would be a good up grade to my laptop?.