If you have issues with this, try the alternative install (scroll down a bit): http://duncsweb.com/2009/07/17/e-has-not-fat-fat32-or-ntfs-format-and-is-not-valid/ Note: Installation may vary with laptop model and flash drive, you may encounter issues, this is just what I did. Here I talk about how I installed Windows XP on my Acer Aspire One A110 with just a USB Thumb Drive (Kingston DataTraveller 100 1GB). This is aimed at a how-to for anyone in a similar situation. This was done using the USB Multiboot Tool (Credit and Kudos to the authors). http://www.boot-land.net/forums/?showtopic=4900