I’ve read several complaints from users at another giveaway site about the program either destroying or negatively affecting their systems. I would highly recommend that if you install the program to not do deep registry cleaning. Registry cleaners can destroy your system if you’re not careful. I had one destroy mine. Comodo System Cleaner. Malwarebytes flags most registry cleaning and optimization programs and and refers to them as potentially unwanted programs. You have to wonder why. I prefer Advanced SystemCare which allows you to uncheck certain options like registry cleaning. I think as long as you avoid deep registry cleaning you will probably do all right with the program. I have used previous versions of WinOptimizer and have never had problems with any of them. I presently use Ashampoo WinOptimizer 16 and it works great. The key is to avoid deep registry cleaning.