You are experiencing slowdowns with your PC? Windows 8.1 allows you to re-install your operating system while keeping your personal files, settings and apps downloaded from the Windows Store.
The procedure is as follows:
From the Start Screen, press WindowsKey + C to display the Charms bar.
Click on Settings > Change PC settings.
Go to Update and Recovery > Recovery.
Under "Refresh your PC without affecting your files", click on Get started.
Click on Next and follow the instructions on the screen.
Windows will check for any inconsistency with the system files, registry or other components, and fix them!
Softwares installed after the initialization of your OS, will be removed. This also include apps downloaded from the internet (web browser, FlashPlayer Plugin..)...
Windows will generate a list of all the programs that have been removed during the Refresh procedure.