I tried to install OSX leopard but I dont know why I couldn't run it, a black window with like "DOS letters" on the screen like loading the OS but nothing happends I could made something wrong

The thing is i want to start all over again but in the right way knowing if i could run it:

Pentium 4 Prescott 3ghz (Hyper-threading)
MSI 875p NEO
1.5 GB ram (can't remember the company but i think doesn't matter)
MSI NX6600

I know its a little old but i love him

So I ask for help, if can i run Leopard or Snow Leopard on this


and the other question is what version of OSX i have to download because on internet i saw different version of the same (i think) OSX

well thanks for the help