Depending on the version of Windows running on your device, you can either use the free automated tool from Microsoft to diagnose and resolve some of the issues that slow your computer down or follow the steps detailed below to identify and fix the issues yourself.
If you use more than one antivirus or antispyware program at the same time, your device may experience decreased performance, become unstable, or restart unexpectedly. To remedy the issue, you should select one Internet security program to run on your device. You should then uninstall the other programs.