My dilemma is: I bought this reconditioned Dell Optiplex gx620 desktop from Rakuten. It was supposed to come ready to use with a Wxp disk. They sent me a disk without a key. I used a key finder online and it says it is not a valid key when I enter it. Maybe they sent me a counterfeit disk? Every 30 days I have to re-install it so I can use this thing. Rakuten never would resolve the issue for me and just said that Wxp was being phased out. I contacted Dell and they said the warranty is expired and I need to buy a new disk from somebody else. I am tired of re-installing this disk over & over...so, who is the most reliable source to buy a genuine Wxp disk from? I just primarily use my computer to watch Youtube and some web surfing.