1. You need drivers. 2. You need an XP install disc. Follow the instructions. When you select where to install the OS. you are given the option of formatting the drive first. You can do a full format, or a quick format which is actually just an erase of the drive. weEvil Thanks for the helpful information. But, I'm not done yet. Opps, I'm wondering during my format session when i choose the full format option and tells me driver C:\ cannot be (formatted/deleted). because i heard this error may appeared during the step of formatting the C:\ HD (many people get in this trouble). So, whats the deal ? How we'll go through this error during installation without problems ? Whats the specific way to do it clear ? Further Information about my LAPTOP condition (If needed): - Its TOSHIBA Satellite Pro A 120 - 1GB RAM - 1.86 GHz - Preinstalled Windows Vista Business OS. I hope i get the help i need. Thanks.