The computer must have SLIC 2.1 to install Win7 with OEM License. To install XP, your computer must have SLP. To install Vista, your computer must have SLIC 2.0. Tool to find out if you have SLP, SLIC 2.0, SLIC 2.1: (x86)(x64) Code: forums.mydigitallife.net/threads/6925-SLIC-ToolKit-x86-x64-(Includes-PKey-amp-Cert.-Backup)?highlight=slic_toolkit Tool to find out if you have SLP: (x86) Code: forums.mydigitallife.net/posts/1538838 How to make an OEM XP CD: Code: forums.mydigitallife.net/threads/7580-How-To-Create-PRO-OEM-SLP-CD How to make your XP OEM if already installed: Code: forums.mydigitallife.net/threads/6077-VLK-and-OEMBIOS-changer... Win7 Installation Guide: Code: forums.mydigitallife.net/threads/23687-Windows-7-Installation-Guide How to make Win7 OEM DVD: 1. Get the ASUS $OEM$ folder from here: Code: forums.mydigitallife.net/threads/12785-7-Oem-Sources-Folder-Project 2. Pick the correct version: HomePremium or Ultimate 3. Download Win7 ISO. 4. Open Win7 ISO in UltraISO or PowerISO. (do not use MagicISO, it corrupts Win7 images and will not boot) 5. Put the $OEM$ in 'Sources' folder of ISO. 6. Remove 'ei.cfg' from 'Sources' folder aslo. (enables all editions) 6. Rebuild ISO. 7. Install with DVD, it will ask which version you want, it will not ask for a key if you did it correctly. You can download Win7 w/ SP1 here: Code: forums.mydigitallife.net/threads/24930-Windows-7-Ultimate-with-SP1-en-de-fr-es-it-nl-tr-pt-pl-sk-ro-tw-cs-sv...-x86-amp-x64-MSDN If your computer does not have SLIC 2.1, use Daz's Loader: Code: forums.mydigitallife.net/forums/39-Windows-Loader