1. In the Win8 file explorer window, right-click the drive letter c, click Properties in the shortcut menu that pops up, then select the General tab and click the Disk Cleanup button (as shown in figure 1).

2. In the list box under "Files to be deleted", you can see that "previous Windows installation" (as shown in Figure 2) and "temporary Windows installation files" occupy a lot of space, which can reach or even exceed 20GB. The former is a file previously installed by Windows, which can be used to restore the system before installing Win8; The latter is the installation file used by Win8 installer. These files are left over from the installation process and can be completely deleted without affecting the system.

3. After clicking the "OK" button, the system will ask "Are you sure you want to permanently delete these files?" , click the delete file button.

Second, transfer the virtual memory to other partitions.

Windows uses the remaining space of drive C as virtual memory by default, and the virtual memory changes dynamically with the use, which makes drive C prone to disk fragmentation and affects the running speed of the system. Therefore, it is best to set the virtual memory in other partitions, which can not only save the space of disk C, but also ensure the system to run more smoothly. No, the following operations set the virtual memory to partition d:

1. Switch to the Win8 desktop, right-click the computer, and click Properties in the pop-up shortcut menu.

2. Under the control panel home page, click Advanced System Settings.

3. On the Advanced tab, click the Settings button under Performance (as shown in Figure 3).

4. Click the Advanced tab, and under Virtual Memory, click the Change button (as shown in Figure 4).

5. Clear the check box before "Automatically manage paging file size of all drives", and then under "Drives [volume labels]", click drive D, select "System managed size", and then click the "Settings" button (as shown in Figure 5).

6. Click "OK" button in turn to close each dialog box.

After restarting the computer, the above settings will take effect, which can save at least 2 times the memory size of drive C.

Third, delete the system update patch file.

Win8 will store the downloaded patch file in the folder C: \ Windows \ Software Distribution \ Download when updating the system. The more patches you install, the larger the folder. Although Win8 was officially released not long ago, the folder size is close to 1GB. Just delete the folder.

After the above operations, you can safely increase at least 20 GB of available space for drive C, ensure the need to install application software, and ensure that Win8 runs more smoothly! By the way, finally, please log in to Win8 with an administrator account to do the above operation, otherwise it will not be completed!