Hello, i bought this new PC -a white box -. winxp is installed. tried to install SP1 then micro$oft said my ID or serial is invalid. did a google search and found that this windows key is a kind of "enterprise leak key" xxxxx-640-xxxx356-23xxx this winxp is un-secure. i mean more unsecure than a winxp with valid key. is there a big difference installing SP1 or just downloading security patches what do i have to do? buy a winxp? or can i continue using this and install all my other soft ... kerio, adaware,.... you know... thank you!