Question:
i run a strong antivirus and my pc has no spyware or viruses. Everything works fine except the fact that it runs slow for things to open.

Best Answer:
Clean your Registry can make your computer faster

Is your computer slower than ever? Does it feel like your computer just can’t open up programs? In this how to, it will teach you ways to make your computer faster.

The one way you can really boost your PC performance is by buying more ram to install in your computer. If you can go to a store and ask them to install more ram, that will help the computer run faster than before.
Step2
Scan your computer for viruses and spyware. Make sure and get rid of any nasty viruses or spyware that are located in your computer.

Step3
Get rid of unnecessary start up programs. The start up programs will load on your PC automatically and slow down your system. Click run and type in msconfig. Click on startup items and uncheck any useless start up programs.
Or use the tool to manage your startup:

Step4
Run disk de-fragment and disk clean up. Both programs will be found in your accessory folder and both clean up the system.

Step5
Clean your Registry
Clean registry make pc faster.
http://tp5pro.com/themosteffectiveregistrycleaner.htm