Please provide more info about your computer. When did this problem start, when you installed VISTA? How do you know this about your CPU? Usually the CPU settings are not adjustable and are part of the hardware of your computer. Your computer may not be able to handle Vista Home Premium. What was your original operating system? You may not be able to upgrade using your existing computer.
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Put a better quality power supply with at least 650 watt. Your P4 MB which supplies the power to the CPU is under fed due to your power supply. You can try this first to optimize Windows Vista
http://windows.microsoft.com/en-us/windows/optimize-windows-better-performance#optimize-windows-better-performance=windows-vista
If you need further help, reach me via phone at https://www.6ya.com/expert/john_31c836b20f0c2290
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If you've scanned it for malware, there's not much you can do, other than replace it, assuming it has enough RAM. Depending on your computer's age, increasing the memory is the lowest cost action one can take to speed it up. If it's more than about 5 years old, it would probably be best to "bite the bullet" and get a new one.
You'll have to be a bit more specific that that.
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