OS 10.4 - Switcher Help - How To Reformat OSX drive?

hey guys,
hey guys,
i installed the latest parallels beta (3120) and installed it.

having never used parallels tools before i didnt need to uninstall it from bootcamp.

so i installed parallels tools on my bootcamp xp installation.

worked great! really really liked it.

i left my macbook alone for a bit and the screensaver came on.
however, when i tried to log back in, the screen stayed black no matter what i did. i pushed all sorts of keys etc. but the screen stayed black.

i held the power button to reboot.


now when i try to boot into osx it says i need to hold the power button and restart, which repeats when i follow that instruction.
and it cant boot into bootcamp, it says im missing hal.dll

i figured, ok, cut my losses, lose my work and reformat like i would in xp. just stick in the disc and go.
so i put in mac os disc that came with the macbook.
it begins to boot from it but then jumps to the restart screen. what a pain!

what can i do guys?
ideally id like to save all my data and applocations on the mac OS, but if need be ill reformat.

any and all help is appreciated.

thank you.