My Windows was repaired; now it is slow and tells me I have a driver in it that's not compatible with stuff. What do I do?

Firstly, check which hardware is giving you trouble and uninstall the incompatible driver. Next, check the hardware specification, usually found on the hardware or on the cover. Once you have found it, go to that manufacturer's website and download the corresponding latest device driver and install it. Then restart your system to load the driver. Alternatively, you can use Google to search for the driver directly. If you have trouble figuring out what driver you need, you can use Method 3 of this article to automatically download the correct driver. Microsoft Windows 10 has information on almost all of the devices used these days to automatically download and update the device drivers.