I bought Ralink 802.11n usb wireless adapter from ebay. When i plugged it in my pc it shows ERROR
This device cannot start. (Code 10)
{Operation failed}
The requested operation was unsuccessful..
Then i plugged it in usb 2.0
Then the error changed to
This device cannot start (code 10)
The usb RETURNED an invalid serial number string descriptor.
But when i plugged it in my laptop and disabled INTERNAL wireless card. It WORKED fine...
I tried everything drivers .. installed windows again.. everything.. still same problem..Code 10 is hardware....no driver is gonna fix it....

I'd return it immediately for a refund and look for a branded product such as D-Link or TP Link....Bro but it is working fine in my laptop.... I disabled my internal wifi card. And plugged it in.. it worked fineWindows error codes are like a barking dog. The are as dumb as a beast.

From my own experience... Ralink devices vary a lot in the way they perform and conform to windows rules.
If the device was super cheap, just forget it.

When buying off eBay, look for devices that come with retail package. Such will have the right model number and maybe a driver disk.

http://www.mediatek.com/en/downloads1/downloads/
This might be of some help.Bro it doesn't matter if you take advice ...or not.
It's a cheapo Chinese knockoff brand....they are kinda prone to failure.

BTW it's likely the laptop adapter was not fully dis-abled...how did you set that BTW ? ?
For what it is worth...
http://www.ebay.com/itm/like/261449251697?lpid=82&chn=ps&ul_noapp=true
The above is an adapter I have bought about three times.
It is fun to play with....
 -- My problem is I misplace them in my junk box because they are so small.