This is my first post. Here's my problem. I got a new computer and transferred all my data to it. My old Dell computer kept having problems. Decided I would try to fix it for my daughter's use. Assumed I knew what I was doing and Formatted the hard drive. I was then planning to put the OS in the CD ROM drive and install it. Problem is I'm getting this msg: "Invalid System Disk Replace the disk and press any key" That's all I get now. I don't know how to make it recognize the CD. Any suggestions?