To laugh at him
No, you cannot.
In some cases, yes. If the BIOS of the motherboard has the proper microcode updates to control the processor, and the FSB (front side bus) is at a high enough rate, you can install a Pentium III processor on the older board.
Obviously, the maximum you can fit on the motherboard. For a Pentium II, this will likely be only 256 MB to 512 MB.
No. There is no possible upgrade for a computer with a 120 MHz Pentium to an 800 MHz processor. You couldn't even replace the motherboard, as the case would not support newer motherboards (AT/Baby AT vs. ATX/microATX)
It depends on your motherboard. It likely uses either DDR or DDR2 memory, and the speeds that are supported vary by the make and model of your motherboard. It doesn't support more than 4gb of RAM.
Install the motherboard first. The drives will have wiring harness to connect to the motherboard.
Yes.
Yes, you can. You can install any system on any computer.
What are the prosiejers to install a hard drive besides the computers motherboard
SImple use Any WLAN card and install it on asus motherboard.
Because you might drop the drives on your motherboard while installing.
You should install it after Windows successfully boots.