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Restart the computer
If you wonder "why my computer is running slow and freezes?," it is possible that a (unresponsive) piece of software running in the background and draining the computer's resources is the reason. Restarting can help if your computer gets slow, because it will close software which are running in the background (and using your computer's resources) even though they're not needed any more, or if a software has become unresponsive.
Also, rebooting should help if you haven't shut your computer down for some time and it performs tasks slowly.
Every program you install (or uninstall) in your computer, modifies the registry. The registry is a vast library of system settings - settings that can sometimes lead to blue screens and other instabilities. Even when programs are uninstalled, their registry settings can stay behind.
The settings are useless to the daily operation of your PC, but they can cause conflicts and errors. Your computer continues scanning these error-ridden registry entries, thus slowing everything down. As a result of this, your computer crashes.
Cleaning the registry manually is not an easy task. Luckily, software which can clean the registry instead of you and fix a slow computer do exist.
If your desktop computer or laptop started running slow after you have installed new programs or games, it is possible that one of them is slowing down your computer. Uninstalling the recently installed programs and installing them one by one, to identify the culprit, should fix the problem.