Win7 solves the problem that C disk takes up a lot of space

Install a pure version of win7, give it 15G, and did not install a few software, actually the remaining space is less than 1G.
The following describes how to solve the problem of large space occupied by win7.
There are three steps: (Of course, make sure that you don't put too much useless things on your C drive)
1, reduce the size of the hibernation file
Run the command prompt as an administrator, type: powercfg –H size 50
Hibernate files will be compressed to 50% of memory, reducing the occupied hard disk space to 25% of memory.
If it is not enough, use powercfg –H off to close it directly.

2, set the virtual memory page file size
run systempropertiesadvanced, open the advanced system properties:
custom size virtual memory

3, compression system installation folder (C: Windowswinsxs Folder)
First of all, you need to get the operation permission: How to get the administrator permission of Windows 7
Operation method: Firstly get the read and write permission of the WINSXS folder (the default administrator only has read permission for this folder), then Select WINSXS right mouse button, regular – "Advanced. ..–" compresses content to save disk space. The compression process takes 10-30 minutes, depending on the performance of the hard drive.

After this three steps, take a look at your C drive!