Really, It is you who make the computer slow, it was fast before you "Put your hands on it". So we'll tell you ways to improve your computer speed and fix what you have spoiled.
Here are some of the top reasons why your computer becomes slow.

1- Registry Errors:

This error alone is responsible for about major pc speed problems, if you started to accumulate registry errors you'll end up with your computer suffocating till it loses its speed.For the top registry cleaner you can try this one and become one of people who enhanced their computer speed at will.
Laplink PCmover Moving Kit Edition (Includes USB Cable)


2- Depleting Out Your Disk Space:

You have a new computer and you feel happy, you keep downloading stuff and filling all the folders and drives on your computer with thing you'll never use or need, ending up with a computer full of unnecessary things and it is slow because its full to the maximum limits.
P.S : a computer is like a human being, when you keep feeding him things he never wants, he ends up sluggish and lazy, becoming more and more fatter, his fitness and performance are degraded. be more human to your computer, dude...

3- Too Many Temporary Files In Your Temporary Folder:

The temporary folder is a part of your computer system and it can be cleaned with one simple action represented by your computer it is called "Disk Cleanup Utility" , or you can go the hard way and clean it your self, but remember it is a system folder and you need the hidden file characterstic you have, I don't recommend to do it manually, instead you can use this available routine in your computer system.

4-Spyware, adware, malware, grayware and trojan horses:

what are all these things mean?
in a snap, I can explain all these things, they are all programs you never wanted to be on your computer but they are on it because of many factors, your computer is vulnerable to all these program while you are surfing the net, or downloading free stuff.

Spyware is a software intended to monitor your computer and can be harmful, it is put mainly to spy on what sites you visit on the internet for marketing and statistic purpose.
Adware is a software intended to provide its creator with information about your shopping trends online, and provide you with links (Ads) such as banner or pop ups to purchase from.
malware is more offensive, it is put to cause fatal error in your computer and cause it to malfunction.
Grayware or Greyware are all of the above kinds of softwares plus others which have a main target: to slow down your computer or act in annoying or undesirable manner.

You can get rid of them with a snap if you tried
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who have proved to be a good performing software in preventing computers everywere, it is available in free trial version, i am sure it will enhance your computer like it did to thousands of other ones.
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Oooops, I forget to tell you about trojan horses, these are programs that consume your CPU performance, it is mainly harmless, but they copy themselves and keep reproducing in other forms and they are hard to detect and control, one or two trojan horses do not affect your computer so much but let us say 100 or 200 , that could make a difference and put your system in a risk. keep them away from your computer for your upper interest!