There is a command that can be used to scan and fix various issues with the operating system. Sometimes it's necessary to have an original installation disc, but you can use the file cache to attempt a possible scan.
To initiate the scanning procedure, go to Start and type CMD, then right click it and choose Run as Administrator. Once the command prompt loads, type sfc /scannow to initiate the scanning procedure. This might take a while. Just sit back and wait until it finishes.
Note: Your computer might restart during this process and it's advised to avoid working on the PC while the procedure is running.