The Guide Show Step-by-Step How-to Install and Quick Getting-Started with Latest VirtualBox 4.2 on Linux Mageia 1-2-3 KDE4 32bit Desktop.
The Content and Details are Expressly Reduced to Give Focus Only to the Essentials Instructions and Commands and Make the Tutorial Easier to Read and Digest ;)
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Download VirtualBox Linux All Distributions i386:
VirtualBox Linux i386.run - Open a Terminal Window
Start Menu Search for "Terminal"

- Check if QT is Installed
which qmake
How-to Install QT4 SDK on Linux Mageia
- Installing Latest VirtualBox
cd </path/to>/VirtualBox*.run
Give Permissions:
chmod +x VirtualBox*.run;
Installing:
./VirtualBox*.run;
- Installing VirtualBox Guest Additions
Linux VirtualBox How-to Install Guest Additions:
Linux Installing Guest Additions