i recently bought a second dell latitude c 600 laptop and it asked me for the product key i have used the
one that is under the base of the laptop but this appears to be incorrect please can you help me to find the right one
You need to use a OEM version of the Windows XP install CD when using the key you find on the bottom of the laptop. The Retail Windows CD will not work for most OEM keys. A Computer Repair Shop should be able to re-install Windows for you.