If your computer has been slowing down recently then the fault may lie with the Windows registry. This is a complicated filing system where Windows stores all the preference and settings files for all the software and hardware programs that reside on your computer.
It’s important to use a registry cleaner that is certified to work with your version of Windows. If you use Vista then you’ll want to use the best Vista registry repair program you can find. This is important because the registry is central to the functioning of the basic operating system. Damage to the registry or removing the wrong files can severely affect the performance of your computer.
I suggest checking out RegCure by ParetoLogic software. This is a very good program made by a reliable software company that stands behind their products.