If you need to free up c drive space on computers, besides the page file, check if hibernation is turned on.
The setting for hibernation is in control panel under power options. There is a tab at the top that says Hibernate. To turn it off, just uncheck the checkbox.
If it is, turn it off; you will free up space equal to their memory size, ie. if it is a 1 Gb memory pc, you will free 1 Gb space on the c drive