Operating equipment: Raytheon TRG 170T-A2.
Device system: WINDOWS7.
Operating software: computer disk C.
1. After opening my computer, right-click the system disk C and select Properties in the pop-up window.
2. Then, we click the disk cleaning option in the lower right corner of the window.
3. Click on the system file and confirm.
4. Click "Delete File" to free up all disk C space.