There is a site called Linux on Laptops [http://linux-on-laptops.com/]which has a directory of laptops with recommendations for a distribution and what problems you may encounter. There is always trouble when you want to dual boot. Before setting that up, defragment the Windows partition. A good thing to do would be to wipe the drive, install Windows, and then install Linux. Here is a tutorial [http://www.matthewjmiller.net/howtos/dual-boot-linux-and-windows/]to dual-boot Windows and Linux on a Toshiba laptop.