just wait the pc booting...
Most likely it cause by your pc is configure to start from CD.. (it is needed if you want to install/boot from a cd)
to start over the installation, just insert the windows CD and follow the instruction.. BUT then if you don't want to see the message again, you need to change your bios setup.
I have a 5 year old off brand computer with 364mb memory,9gig hd and pentium 3 cpuand XP os. When I boot up the sequnce goes to "looking for boot info on cd-rom." the light on the cd-rom carrier comes on but when I click on enter I get a window that says"file in config system is corrupt or missing". Can I get into DOS to clean the hard drive and start all over? Need help.