vista hidden stuff code improve security firewall

[youtube=http://youtube.com/watch?v=l5P51TaCNhA&fmt=18]
 
This video will show you how to enable the DEP feature in Windows Vista 32-bit. Now lets boost up the security in Windows Vista! We will be using command prompt for this whole video. Below you is a little information that you might want to know.
Codes:
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1. bcdedit.exe /set {current} nx OptIn
2. bcdedit.exe /set {current} nx [...]