My winxp has been locked by microsoft, :-<

[gabri3l]

Yes for SP2 you need a 640 PID. In SP1, Windows XP will fail to install on installations of Windows with one of the following product IDs: XXXXX-640-0000356-23XXX and XXXXX-640-2001765-23XXX and the corporate version beginning with FCKGW. Now it looks like any keys without a 640 PID will fail. Using MSkey4in1 (google) you can easily generate a 640 PID. But when using or generating a 640 key make sure you don't fall into the already banned SP1 range.