Installing Windows XP using a USB flash drive is a bit trickier, since Microsoft doesn’t offer an official tool. That’s where a free app called WinToFlash comes in.

The installation type screen will now appear; select Custom: Install Windows only (advanced). A list of all the connected drives will now appear; select the SSD in which the OS will be installed.

Update 2: If you’re trying to install Windows 7 on a netbook, Microsoft is making things even easier. Just use the Windows 7 USB tool.

Install the Windows 7 USB/DVD tool. Once the utility opens, you should be able to browse for and select the Windows 8 ISO you downloaded as well as the USB drive you inserted.

sorry for posting here..i hav a laptop w/ "dirty" hdd, no floppy, no internal cdrom.. just an external (usb cdrom)..how can i install windows xp on dat laptop?when i started d machine, and usb ...