Hi DINESHGHELOTH,
Welcome to the Community.
Let me know the wireless card and the operating system installed in the system so that I can provide you with the correct driver.
Also, you may perform system restore for the date the wireless was working properly. Please click the link mentioned below for system restore:
NOTE: System Restore will remove the applications installed after the restore point.
Thanks & Regards
Manshu S
#iworkfordell