Also, this will depend on your settings and hardware.
Windows 7 also creates a hibernation file and a page file on the primary disk. These are a percentage of hardware memory in size, and could easily be what you are looking for to get rid of.
If you don't plan to use the hibernation feature, you can remove that space-hog easily.
Open an elevated command prompt (find Command Prompt in your Start Menu and right-click, Run as Administrator)
Type "powercfg -h off" and press Enter.
This disables hibernation and removes the file on next boot.
The page file is a little more tricky, simply cause of bad software authors (it's a long story, short version follows). I have run without one for years effectively, until some application decides it "NEEDS" one, and acts weird without one (crashes, randomly slow, etc.). I honestly don't remember the application that makes me say that now, but the solution was reenable the page file.
There are many guides talking about what your page file "should" be set at. With modern memory management, you really don't have to mess with it unless you need the space. Then it would depend on what you are doing and how much extra memory you really "need" as to how big to make it.
In the end, maybe you could update your question to have more details? I'm not sure exactly what you meant in it.