Most Windows XP, 98SE, NT and 2K Original Media is bootable.
You will probably have to set your optical CD drive as the first boot device first.
With XP and 2k , You can either use the recovery console provided there or you proceed part way into the install and it will attempt to detect previous windows installs. If it Detects one , you may be able to (R)epair it from that screen.
This is all possible with out a "Recovery Disk" that windows has created post install or as a part of the prior install.
This is assuming you don't have a HP/Compaq style computer where the stuff needed to reinstall the system is on a "recovery partition" on the HDD.