Is it possible to rplace the ralink rt 5390 network adaptor for a better one

I have just bought a compaq presario cq57 ,the problem is that the wireless network adapter is rubbish .I have reset the Bt home hub in every configuration possible ,different channels and different security and i am sitting right next to the router but cannot get any speed above 54mps and that fluctuates wildley between 18mps and 54mps .Having read up on this problem it seems to be a known issue with this laptop and was wondering if a replacement card was available to get better speeds upto the or above the 150mps this adapter is supposed to be capable of .The only one i seen listed on HP's site is a a/b/g/n with bluetooth but even that is said to be the wrong one .
Any help or advice will be appreciated

You're very welcome.
Your product number indicates that you have a Compaq Presario CQ57-426SA Notebook PC.
Below is the link to the support and driver page for your notebook.
http://h10025.www1.hp.com/ewfrf/wc/product?cc=us&dlc=en&lc=en&os=228&product=5211140&query=A7S38EA&s...=&
While there is no specific manual listed, I found one that must cover your notebook as it contains relevant info matching things like processor specs, etc.
http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c02948186/c02948186.pdf
Please see chapter 3, page 21 for the list of supported wireless cards with corresponding HP part numbers.
Any one of those should work. If you are looking for a dual band card, the only one I see that is capable of working on both the 2.4 and 5.0 GHz frequencies is the Realtek 8188BC8 802.11a/b/g/n 2×2 WiFi and Bluetooth 3.0+HS Combo Adapter, HP part # 602993-001.
You can order it at the link below, or look elsewhere. Do your search by the part number or you will most likely get a card that won't work.
http://h20141.www2.hp.com/Hpparts/Default.aspx?mscssid=84D5E89A4F864E04AD56B356C6E8CEE8
I will note something that concerns me when I enter the part number of the above card in the HP parts store. It only comes up as a Realtek B/G/N 1x1 card. It does not match the description in the manual.
This is not uncommon. Replacing a wireless card in a HP notebook is oftentimes extremely frustrating.
Good luck.
Paul

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