Hello. Sorry for making a thread just for this but I couldn't find the serial number for my Windows version online. Could someone please help me install this thing? It's a very old Evaluation version of Windows XP Professional 64 bit. I don't think that there are any service packs included. I'm stuck at the "Enter your product key" window and I can't skip it. I've tried every possible CD key out there and none of them is valid. It looks like it expects some kind of trial key. It says "The 25-character Product key appears on the yellow sticker on the back of your Windows CD folder" and it's also showing me a small yellow image of how the product key is supposed to look. Any help is appreciated. Thanks.