Save yourself a bunch of time & headaches.
As a precaution make a backup of your data; Desktop, Documents, Downloads, Favorites, Music, Pictures and Videos. Make sure you have product activation codes for any installed software requiring a product activation code (Microsoft Office, Quicken etc.).
Once you are satisfied you have backed up everything you need and you have the necessary product keys, please proceed.
Press the Windows and R key to open the Run Window. In the Run window enter Control Panel and press OK. Select View by Large icons and choose Recovery.
Option 1... From the Advanced recovery tools window, choose Open System Restore. You will be notified immediately if no restore points are available. If this is the case immediately close the window and proceed to Option 2.
Click Next> on the Restore system files and settings window and select a restore point prior to the failure occurrence. If the selection of restore points does not include one prior to the failure, immediately close the window and proceed to Option 2.
You may wish to Scan for affected programs before clicking Next> to confirm your restore point. When ready click Finish to initiate the System Restore proceedure. This process may take a few hours, do not interrupt it.
If the restore proceedure is successful and resolves your issues, Congratulations the tedious part is over. Install your programs affected by the system restore. Otherwise proceed to Option 2.
Option 2... From the Advanced recovery tools window, click the 'If you're having problems with your PC, goto Settings and try resetting it' link.
On the Recovery window choose Get started under Reset this PC. Selecting Get started gives 2 recovery choices...
1. Keep My Files. (Desc. Removes apps & settings but keeps your personal files).
2.Remove Everything. (Desc.Removes all our personal files, apps and settings)
I recommend option 1. because you save your personal data and only lose your installed Apps & Programs. A list of apps & programs will be saved to your desktop after recovery completes.
Click Next and on the Warning dialogue box, click Next. To initiate the process, click Reset. Remember... Patience is a virtue!
Best regards for successful results!