need walktrough.(Buying laptop and W7)

Ok... so Clean Install means that I upgrade Vista to Windows 7, however it works like a full "computer reset"?
Or haven't I got a clue..?
And I can't get 64 by doing either of those things?

Correct with the exception that the full install doesn't ask for a previous Operating system. The upgrade will ask if it doesnt see one already installed.

Yes you can get the 64-Bit but it will require a clean install when upgrading from a 32-Bit Operating System.

The upgrade disk is for people who already have Windows XP or Windows Vista. You are basically getting a discount for being a repeat customer. It has no bearing on how you can actually install the operating system.

So, with this new laptop I'm buying I could buy the Upgrade and do the Clean install and upgrade to 64 as I won't have anything in it except the things on from the beginning?

Yes and then you would have a fresh new system and make use of all 4GB memory.

Correct. However the only thing that will be installed is Windows 7 itself. Usually any new computer comes with trial software, utility software, etc. None of that will be installed after a clean install to 64 bit.

But do I need to setup the computer and have it up and running and then put in the disc and like what? choose clean install?

Make sure the BIOS is set to boot from the DVD drive first. Put in the disc and reboot. You should see a prompt to "Press Any Key To Boot From Disc". Do that and the Windows 7 OS will begin it's initial phase of installation. Then it will let you choose to do an "Upgrade" or "Custom Installation" (also known as a Clean Install). Choose the custom installation and proceed to the next step.

You can then choose to delete existing partitions, re-configure partitions, re-format, etc.

I have always chosen to delete the existing partitions, then make new partitions (usually about 40-64GB for the OS) and another partition for misc. files and a small one for the paging file. Then install the OS to the first partition and let Windows do its thing.

For a good step-by-step guide on a Windows 7 "Clean Install" go HERE.

Yes, I have already read the guide, and this is becoming more and more clear to me.
I'll be removing the partition containing the old OS right?
And then just do as the setup says?
Won't the computer automatically ask to boot from the disc when I have it in?
Or do I need to setup this before, as you said.
Well I know some people that are quite handy with BIOS etc but uh..

I could be that the computer is already configured to boot from the CD/DVD drive, it may be a question to ask the place you are buying the computer from. If the boot from CD/DVD is "turned off" it can be turned on in the bios OR there is usually a way to show and pick from any drives in the computer. In my setup. I can press the F8 key and get a list of my drives (hard drives and CD/DVD drives). I can then select my CD/DVD drive and voila, I am booting from it without mucking in the BIOS.