If you use your computer actively and regularly, then you might have noticed that it is starting to get slower over time. Even though you are not installing any new programs or saving large files on your hard drive, your operating system seems to get slower. System clutter accumulates and this causes your PC to become slow. You need to conduct a Windows cleanup to remove traces of system clutter and delete unnecessary junk files that you have on your system. This will greatly improve the speed of your PC.