No wireles security key prompt after system restore

Hi and welcome to TSG.

Are you saying that you can successfully connect to your wireless network but do not need a key to do so or that your computer can not even find it to try to connect to it?

In the first case, have you used your wired connection to the wireless router to confirm that wireless encryption is enabled?

In the second case, have you used your wired connection to the wireless router to confirm that the wireless access point is actually enabled in the wireless router? If it is enabled, is it also set to broadcast its unique SSID? If broadcasting of the SSID is disabled, you can either enable it on the router or you will need to manually set up the wireless connection on the computer.