Buying PC

[MH-LABEEB]

CPU
This is what controls everything in your computer.
Be it the processes, the components or even the
minutest operation like the volume, it handles
everything. So take due care when selecting this
component during your computer buying process.
There are 32 bits and 64 bits processors available
in the market. Get a proper review of the 32 bits
and 64 bits processors, before selecting the
computer processor you want. AMD and Intel are
the two major players in this field. Review the AMD
and Intel chips, before selecting the CPU for your
computer. The other most important factor that you
need to take care of is the processor speed. The
unit of processor speed is GHz/sec.

Didn't understand this part....
What Is the big difference in 32 bit and 64bit procesaor.

And The main part...
ADM and Intel ...
These 2 are running me!!!
Which is the best just tell me...
In other way I need to know is core i7 or i5.,which is good.