
Open up an administrative console, type "cd /d %TEMP%" (without the quotes, of course). I recommend you try to delete the TEMP folder. %TEMP% Files - Even though Disk Cleanup is great, sometimes for whatever reason it doesn't always get stuff out of the TEMP folder.

Don't turn it off if you use the feature. From an administrative command prompt, type "powercfg -h off" to get that space back. Plus, I have 12 gigs of RAM, and hibernation uses as much disk space as you have RAM. Disable Hibernate - I have a desktop, and I prefer just three power states, sleeping, on or off.After you run it, run it again and click Clean Up System Files to get files that you need to be admin to delete.

#Best free disk cleaner for windows 7 install
Clean up after Windows 7 SP1 (Service Pack 1) - After you install Windows 7 SP1, it leaves around the original files so you can uninstall the Service Pack if you want.

However, if you take a few minutes, read carefully and do even a few of these tips or just run Disk Cleanup, you'll get lots of space back. Please read carefully and with all things you find on a random blog, be careful because you have no one to blame but yourself. I've got a 256 gig C: drive, but noticed that in the last week or so I'd had only 20 gigs free. This is an " updated for Windows 7" version of my popular original article Guide to Freeing up Disk Space under Windows Vista.
