Not true at all, but these applications aren't for just anyone. I've personally never had a single problem and I've been using them for years. When you run into problems it's typically because you're cleaning crap out that you shouldn't be. I.E. cleaning out chipset drivers when you only intend to clean out display (such as when you run a mobo with an Nvidia chipset). As a general rule of thumb, if one plans to perform a clean driver installation with one of these applications, it's a good idea to go into the process with the intention of uninstalling, cleaning, and reinstalling chipset, display, and possibly other drivers relative to one's particular system. As I said, these applications aren't for everyone. It's probably safe to say that only users who have a full understanding of their particular PC and the processes involved in a clean installation should use these applications (for example, I am fully capable of performing a clean installation manually as I possess the technical knowledge to do so; however, driver cleaning applications save a lot of trouble and I much prefer to use them).