1. Clean it up with third-party software such as CCleaner first. \x0d\2。 Change the path of user files, my documents, my music, my videos, my desktop, etc. To the non-system partition (files will also be moved) \x0d\3. Reduce the space occupied by system restore of system disk, set most virtual memory to non-system partition, and clean up the system restore point. \x0d\4。 If you don't use the hibernation function, you can enter cmd in the start menu, right-click cmd to run as an administrator, and enter Powercfg _h off in the newly opened black window to turn off the hibernation function and delete the hibernation file. \x0d\5。 Delete irrelevant programs, especially those installed on the system disk. You can also use the method of moving. For example, to move the media player attached to the system to the Program Files directory on drive D, first move the Windows Media Player folder under C:\Program Files\ to D:\Program Files\, and then open cmd as an administrator. Just enter mklink/j "c: \ program files \ Windows Media Player" and "d: \ program files \ Windows Media Player", and it will be moved to drive D. The Windows Media Player icon in the start menu can still be used normally. It's easy to recover, just delete the shortcut of Windows Media Player under C:\Program Files\ and move the one on D disk. \x0d\6。 Move patches and software downloaded from 360 and other similar software to other partitions and change the path. \x0d\7。 Enabling disk compression in the Program Files folder property can reduce the space occupation without affecting the system performance {nttwqz original answer}. \x0d\8。 Change the cache or temporary file path of common players to other partitions and clean them up. \x0d\9。 Change the download software path to another partition, and the file will also be moved. \x0d\ 10。 It is recommended to reinstall the operating system at least once a year. This is the cleanest conditional, followed by all procedures-accessories-system tools-disk cleaning -c disk is the simplest.