Allright, i decided to try out the Bootcamp and pu the XP on my mac for 20 gigs, because the mac has the lack of the operating system, when so many things aren't made to a mac too. I opened the Boot Camp assistant application, and ran it to make the own space on hardware for XP.
Then there appeared a message saying i have to make a backup for my mac (130 gigabytes to COPY!) and have to change the another backup hardware to a Mac OSX taltio.
Right, when i got one from my dad (it had space for 250 gigs, i was in luck), i just plugged in the USB thingy and started to make a backup from my mac. It took like a one night to do that.
When it was done, i changed the thing to a Mac OSX taltio with the Disk Utility thingy with the MacOSX installing disk... then i was shocked and like jizz'd in my pants: i changed the MAC'S HARDWARE to a backup disk! I didn't even can't start the mac because i hadn't any kinda of starting hardware. That means there's NO WAY to fix that problem.
...but i knew a way:
Thanks for the backups, i got the Mac revived back to live in like 2 whole days (49 hours or so!).
I'm happy there's everything at normal again, the mac just made a little trip at different hardwares... I'm amazed it did even update the system by itself, my mac doesn't crash anymore when i open 18 same programs at same time (i mean the big ones: Protools, Native Instruments at standalone...).
But the BEST part was that... the Bootcamp did work at this time!!! Now just let's put the XP installation disk to the superdrive and let's do it to the finish...

I'm happy I didn't kill my 1500$ system :D