Can I delete the files in ~/Library/Preferences and have all preferences reset to factory default?

I have this folder inside my /Library folder called Preferences. I was wondering if I could delete all of the files inside this folder and have all of my preferences reset to the factory default?

First, why would you want to do this? I ask because all of the applications installed also have preference files. Some of the preference files store things like serial numbers. Some programs that use plugins that use serial numbers also store the serial numbers in the host program's preference file. RapidWeaver is an example of this.
So, If you deleted all of the files in your preference folder, you could have some major headaches for a while afterward.
If you are curious, there is a program called AppleJack that only runs in Single User mode. It can check preference files for you. There are several others available that cost money. AppleJack is a free open source application.
Hope this helps,
Craig

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