4.Registry Cleaning ? In windows operating system based computers system configuration information is centrally located in the registry. While this simplifies the administration of a computer or network, one incorrect edit or unwanted entry to the registry can disable the operating system. Registry Editor (regedit) enables you to inspect and modify the registry entries, but you are advised to stay away from such modifications. It's better to use a third party automated tool for automatic cleaning of registry.

5.Removing Unwanted Startup Programs ? When we install some software or tools, a few of them installs themselves on System Startup, which makes system booting a slow process. You can remove those unnecessary startup programs through Windows Configuration Utility. Using this utility is very easy, follow these simple steps:

a.Go to Run Menu (Press Window Key + R)

b.Type msconfig and Press Enter/return Key

c.You'll see Windows Configuration Utility Window

d.Go to the Start Up tab and uncheck the items which you do not want to invoke at startup.

6.Virus Checking ? Sometimes slow functioning of system is result of virus infections, or it may be due to malicious worms, and Trojans which uses system resources and causes slow functioning. The solution of this problem is to use an Antivirus program like Norton Antivirus, McAfee or AVG Antivirus, all of them provides facility of auto update of its virus definitions. For home use it's not mandatory to use a licensed copy of Antivirus. You can try free versions of Antivirus programs like AVG which are capable of providing perfect security against all virus threats. Regular update of virus definitions ensures protection from latest viruses.

7.Configuration Issues ? Another reason of slow functioning of your personal computer can be old or out of date configuration. It can be if you have a few years old computer and you are running latest software, in that case it's better to check the RAM and Processor of system. Most of the time just RAM upgrade can solve all issues, processor change is not required