I associate thinkpad X220i laptop with win7 system. The total number of G on system disk C is ***42, so I always feel that the space on disk C is getting smaller and smaller.
Right-click drive C to enter the properties interface, click the disk cleaning option, as shown in the figure (as required), then click Other Options, click Clean in the column of System Restore and Shadow Copy, click Delete in the new interface and confirm. OK,