Normal, not too big, WIN 7 is generally 8- 10GB. But it can reduce the weight of the system:

First, turn off System Restore. Right-click the computer on the desktop-Properties-Advanced System Settings-System Protection-Configuration-click "Turn off System Protection"-OK.

Second, disable the hibernation function. Open the "Run" window, enter the "cmd" command and press enter, open the command prompt window, enter "powercfg -h off" and press enter.

Third, move the virtual memory to other partitions. Right-click the desktop computer-Properties-Advanced System Settings-Advanced-Settings-Advanced-Change-click on drive C-select "No Paged File (n)"-"Settings", and the virtual memory in drive C will disappear; Then select drive D, select "Custom Size"-enter values in the following two text boxes of "Initial Size" and "Maximum Value"-Set-OK-restart.

4. Download the third-party software "Rubik's Cube" or "Win7 Optimizer v 1.7" from the Internet to clean up junk files; Use the Rubik's Cube slimming system, open the Rubik's Cube-Clean-Slimming System-Check the files to be cleaned-Slimming System-Prompt, and select Yes-OK.