I have a Dell desktop with nearly 120GB of storage, so being able to clean up the clutter that it leaves over time is a must to keep the system cleaner and operating at max speed. The Window Washer setup program will automatically detect and display which programs you have that can be cleaned up and you have the option after installation to edit the ones you want cleaned. I love the option to wash my free space to clean up trails of leftover bits of files as I install and uninstall new programs fairly often. I have also used the Window System Eraser disk utility to clean up the hard disk of an older IBM Thinkpad for donation and it works quite well-it's easy and pretty fast. I haven't had a problem using this software since I installed it nearly a year ago and am quite happy with it.