i need help, need a boot disk

What are the specifics -

OS - Win 3.11, Win-95/98, Win-Nt, Win-2K, Win-XP, MAC-OS, Linux, Solaris...

When did it start - did something happen, installed something -

The question is way to general to attempt to answer the question ...

You haven't supplied much info dude, but I'll give you a few options

"No IDE or fixed disk present" error mean the likely hood is that your hard disk has failed.

Non System disk errors mean that either you have possible corruption in you Boot files (Dependant on Operating system) or you've possibly deleted
some files that where required.

dependant on operating system the easiest way round this (i'm guessing at your technical level based on above request) is enter Bios and (if possible) change Boot order to relfect your CD-Rom drive first, insert your operating disc and run setup over your existing system.

Most OS's from Win95 up will give you the option during install in one form or another to repair and existing build, you can even carry out a re-install in the same folder name as the previous OS and retain your current settings.

There are many various things that can be checked, but these can be complex and not knowing your level of expertise I've just given a couple of easy options.

If you need more help post up here with some more details.

Regards

Martin Mack