Hi there, i'm just a noob, so try to explain in human

I have tried to install Ubuntu 7.04, Mandriva 2005, Mandriva 2007 Spring and i can't even boot it (Mandriva 2007 got it installed, but the OS doesn't boot it just hangs) And with some Knoppix LiveCD...

In all this distros my computer just freezes and i have to reboot

This are the specs for the machine (very old machine) where i'm trying to install linux:

Processor: Intel Celeron 4, 1700 MHz (4.25 x 400)
Motherboard: Intel Brookdale-G i845G
Video Card: NVIDIA GeForce4 MX 4000
RAM: 640MB
HDD1: 153GB total (The linux Partition is 9.9GB and a 1.6GB Swap)
HDD2: 28GB

LiveCD's can be very memory intensive.

Download memtest86+ and test your memory.

Leave it on all night or if your impatient let it run for 3 passes.

Overclocking? Try dropping back to the stock speed; Linux can be a bit fussy when RAM timings and/or CPU settings are too aggressive. I have had several CPUs that would overclock just fine with Windows, but have apps, X, or the whole OS just bomb.