It will say that if you have the incorrect CD inserted. you might want to insert the correct disk in order for it to work properly
keep trying till it works, or shutdown and get back on :)
CD rom means: Compact Disc-Read-Only MemoryIt's a disk that cannot be erased, only read.
Your CD that you're using isn't supporting your operating system most likely. Answer. If your PC restarts every time you put a CD in cd-rom then its the problem of your power supply. I had it too....
your USB drive is toasted - bin it and buy another one see http://wiki.answers.com/Q/How_often_should_you_scan_your_USB_drive