Clean your Windows [Win]
“CCleaner is our system optimization, privacy and cleaning tool. It removes unused files from your system – allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history.”
CCleaner is free. It’s a good idea to run it from time to time as it removes lots of temporary files and other junks. If you are short of free space, think of CCleaner.
It has lots of options but usually I don’t bother about them. The default settings are good enough.