You now have FOUR options. Follow this guide here, Print this page and follow the guide on paper. Follow a video guide ( I am currently updating the videos as the ones shown are from the pervious website layout) Or you could simply load clean my pc onto your mobile and follow from there, don't forget to rotate the phone for a bigger picture.
I have several drives on my computer but my system drive is the R: drive. Yours will probably be the C: drive. Either way, Wisecare will indicate which is the system drive by showing the version of windows you have installed i.e. Win10 Enterprise. If you have multiple drives, uncheck all those drives leaving only the Windows system drive checked.
When Wisecare has finished scanning the system files, it shows a list of files that can be deleted as they are no longer required. These are the ‘tmp’ and ‘chk’ files, ‘tmp’ being temporary files and ‘chk’ being check files that are fragmented files created by Windows. Now simply go ahead and clean those files out of the system by clicking the link Clean.