Win10 system windows.old file cleanup steps

The release of the Win10 preview version has made many users happy to upgrade their systems, but this version of the system is still in the testing phase, so there are still various problems, and now there are some users on how to delete windows. Old file, I feel quite confused.
Q: How to delete the windows.old file? Always say no permission

A: Here, I will introduce you to a very simple cleaning method.
First open the C drive, click on the properties, and organize (a progress bar will appear).
The second step is to clean up the system files (a progress bar for a scan will appear).
The third step is to have the previously installed Windows in the scanned list. Check and clean this, you can delete it.
Of course, you use 360 ​​to clean up, directly forcing this folder to drag to force deletion, it is also possible.
How, it's still very simple. In fact, although the Win10 preview version has changed somewhat compared with the previous version, some problems are handled similarly to the previous version, so if you don't know how to solve it. If you want, try using the previous version of the method.