How to turn off the DEP feature of Windows XP SP3

Some friends don't like the DEP (Data Execution Protection) feature of Windows XP SP3, because some software is always disturbed when it is running, and you want to completely turn off DEP as follows.

We need to do something about the C:boot.ini file.

First, change its read-only property, right-click the file, select Properties, and cancel the read-only property.

Then use Notepad to edit the Boot.ini to find an entry that starts with multi (0) disk (0), at the end of which is/noexecute, which is the flag that DEP is in effect. You can change the/noexecute to/execute and finally reboot the machine. This turns off Dep.