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kernel task high cpu usage 300 percent macbook pro

well, i have a macbook pro 13" core i5 running on snow leopard 10.6.8.
after several months, i have this problem where my macbook became slow and sluggish while running program and start up.
after searching for solution for several hours, i hardly found the exact solution.
so , what i did is i delete one kext file.
here are the steps.
1. run in safe boot. did this by hold Shift key during chime sound while starting macbook and release when circle loading thing appear.

2. go to finder > system > library > extensions

3. find file named IOplatformpluginfamily.kext

4. right click on IOplatformpluginfamily.kext > show package content > contents > plugins , you will see ACPI_SMC_PlatformPlugin.kext

5. right click ACPI_SMC_PlatformPlugin.kext > show package content > contents

6. click on "Resources" folder  then move to trash

7. make sure you drag this file from the trash to the desktop for restore pupose.

8. restart your macbook



to improve performance, i also use SSD

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