Hello, I have a Dell Dimension E510 that has a XP MCE 2005 COA sticker on it. The hard drive died on me so after replacing it I tried to do a clean install of XP MCE using a CD that I downloaded elsewhere on this forum. All was well until Setup asked me for the product key. I entered in the key shown on the sticker on the computer and it tells me that the key isn't valid. Any ideas on why? Sorry I'm a noob and know nothing about retail, OEM, VL, SLP, etc., so I didn't understand the sticky threads very well. Any help would be greatly appreciated! Thank you!