Originally Posted by cornelissen1981
i have a laptop 2g processor i would like to start using unix
As stated above, you asked about CPU architectures, not about OS's. Since you already have the laptop, you don't have much choice of architecture. Your laptop is only compatible with one or maybe two of the architectures you listed.
Since you didn't say what your laptop is, we can't really be sure. But I think we can be 99% sure that your laptop is compatible with X86 and nearly that sure that an X86 OS is your best choice.
Probably your laptop is also compatible with AMD64 (more commonly called X86_64) but most likely you will be better off with an X86 OS rather than an X86_64 OS. If your laptop is compatible with X86_64 then those are your only two architecture choices (X86 or X86_64). No other architecture OS will work at all.