I have an Acer Aspire 3680 notebook which I bought new in 2006. The hard drive has finally died and I was lucky enough to find another IDE 2.5" drive to replace it. However, I can't remember the build number of my original installation of Windows XP SP2, and my original license key has been rejected so far with every attempted install of Windows XP. Therefore, I must assume I am trying to install the wrong build and the kernel is not compatible with my key. Can anyone help?