I had a computer built in 2003,windows xp pro installed,no disks provided,etc.Of course now when I try to validate I am told I am not genuine.I have no counterfeit disk to send in,no bill of sale,etc so I can't get the complimentary package of the key,etc to make my copy genuine.What are my options other than spending $199 for a new copy of windows XP,which I hesitate to do because the new windows "Vista" will be out next year,and before we know it windows XP will be obsolete.If I do nothing will my windows system get attacked by viruses.So far I am fine,I have the windows firewall,and an anti virus program installed.I have even been able to update windows regularly until a month ago.