Are you having a issue after reinstalling windows. Here’s how to fix that problem just go to the manufactures web site the go to their support page and look for downloads and drivers. Then once your their search for your computer by the model number or mane e.g. “Acer Aspire One, Dell Inspiron 5150” the look for the video drives download the file to your desktop the extract or install the executable file e.g. “ driver.exe or driver.zip“ once you have ran the file restart windows and it should be working then. Hope this helps someone.