When I try and install my Windows XP Pro on my wifes computer, (new hard drive) It will run through everything. Formatting hard drive checking system partitioning hard drive. But when it starts to copy files, I get a message. It's always a drifferent file but it says "(Whatever) file cannot be copied. The file setup placed on your hard drive is not a valid Windows XP system image. If you are installing from a CD, there may be a problem with the Windows XP CD." I know this CD worked, I've loaded it on her computer several times because of hard drive failures, motherboard failures and other things. I got this copy from my IT classes when I was in school last year. One copy was given to all the students because we were a Microsoft certified school. We all got one copy and one product key, which is no concern because I use it on the same computer with the same NIC card so the mac address is the same. The only thing we didn't get was the COA. My question is, does anyone know if Microsoft will replace a damaged XP pro CD if you don't have a COA or if it is a student copy? Thank you for your help.