Hi,
Have you made any recent changes to your computer?
Method 1:
Try to reload the Wireless Network adapter drivers.
Uninstall and re-install the network adapter drivers. Follow the steps mentioned.
a) Click on Start, Right click on computer.
b) Click on properties, click on Device manager
c) Expand network adapter, Right click on the wireless adapter option
d) Click on uninstall
e) Now go to your computer/Wireless device manufacturer website, download the updated drivers and install them.
Method 2: Wired and wireless network connection problems in Windows
If issue persists update network drivers from the manufacturer's website or windows updates.