Try booting with the install disk in the drive and when the screen comes up asking you if you want to install press F1. Then type in rescue and oress enter. In the next menu there should be an option to linstall a bootloader (LILO I think). Install LILO. Take the CD out of the drive and reboot. Now you should get a screen that asks you if you want to boot to linux, windows, failsafe and something else. Just choose which you want and press enter.