Look in devicemanager
Look at "Network Connections" in "My Computer"
Of course with the limited amount of information you have supplied your problem might be any number of other things than NIC failure. Your wireless router might need to be reset, Something might be interfering with the wireless signal,
Nothing you've said eliminates a software problem.
"My wireless stopped working" is not a sufficiently detailed description of your problem.
Goin' Fishin' (Some day)