Windows Genuine Advantage Notification

[Nightmare On Gates Street]

I'm a newbie, so excuse my ignorance. I have an OEM Corp. version of XP. Update was set to download but not install the Windows Genuine Advantage Notification update. Our boxes have changed hard drives, motherboards, everything along the way. Program was installed on one box and the nightmare ensued. Product or Code Key not authentic, etc. I don't want to continue to get pop-ups reminding me that "downloads are ready for installation" on the rest of my machines. Since it has been downloaded, how do I remove it? (I'm not going to pay for another copy!) Thank you.