I have a COA on my second-hand PC. I try to install XP to use th COA. but it say the serial number is invaild. SO I search info by google, it say there is a sp2c version XP to use new key. I think my COA is with SP2c key. Who can upload Windows XP SP2c? The volumn label is CRMPOEM_EN. Do anyone have the info about it? What is different from VX2POEM_EN, which I try to install XP used.