Makeuseof posted a tutorial about automatically keep Windows 7 clean of obsolete files

Windows has a way of collecting virtual dust, a circumstance that has not changed considerably in Windows 7. These obsolete files take up space and contribute to hard drive fragmentation. While neither of this is a big issue, it is an annoyance, one that you can easily take care of.

In this article I will show you a simple way to regularly and automatically clean your Windows 7 system. This won’t require you to install yet another cool tool and is thus low on system resources. At the same time you will also learn how to automatically run other tools for other tasks.

  How To Automatically Keep Windows 7 Clean Of Obsolete Files