First thanks to izogi i do not know his real name but really help me out for resolving this USB Audio Driver issue
He observed that usb.inf file missing form %windir%\inf so I copied the same usb.inf from Windows 7 32 bit os and paste it in %windir%\inf location in Windows 7 64bit os.
You can download usb.inf file file.
Grate it working like champ.
Thanks to izogi