Mike recently upgraded his old Acers to Windows 10. But after running the Microsoft System File Checker, he's having issues accessing features in his account, particularly settings. So he did a repair reinstall. Now he can't get back online to the Internet.
Leo says to go into the device manager (Windows + X) and see if any devices are missing or have a red "x" or "!" in the corner. It could be a driver issue. Also, look in the settings to see if sleep is enabled and turn it off.
But your WiFi card may not be supported anymore. Luckily, they're cheap.