How do I install an OS like Windows 7, Vista or XP from a pen drive on a laptop?

Hello, I have a query and I need to ask you for your advice and help. I have a netbook and I want to install Windows XP on it without a CD as it does not have a CD / DVD ROM drive or a floppy drive.  Since I don’t have the option on my netbook, is it possible to do this? Is there any way I could install Windows XP without an optical drive, because I also do not have the budget to buy an external drive either? However, I have a 4GB Kingston Data Traveler pen drive and I had read a few articles about booting Windows XP from a USB flash drive and installing the operating system on a laptop or PC. Am I right, and is it possible? Please help me out as I am presently using Windows 7 beta version and it restarts automatically every hour. I need to remove Windows 7 that came with the netbook and install Windows XP. I am very comfortable using Windows XP and don’t want to use Windows 7. It also seems to be running slow on my netbook. Please help. Click here for full story