If you've been asked to run the SFC /scannow tool, it's likely that you have a problem which may be fixed by repairing missing or corrupt system files. Using this tool can sometimes resolve having to perform a full system restore, or sometimes cure unusual oddities that have developed.

To begin, type in cmd in to the search box, then right click Command Prompt and select Run as Administrator:


Once the command prompt has appeared, type in sfc /scannow and press enter:


Once this is complete, it will tell you if any problems were found and if they were able to be fixed. A filepath to the SFC log file will also be displayed so that you can view more detail - the logs are normally visible here: