How do I Uninstall Windows 8?

[Realitycrash]

This is like a bad fucking joke. I know people hate Windows 8, and so far I've been alright with the system, but now this..This is just retarded on so many levels.
I've been having some graphic-card issues that I have posted about before (and still haven't solved, sigh), which has prompted me to investigate if the source of the problem isn't compatibility with Windows 8.
Well, I tried booting my Windows 7 disk, and it doesn't work. I tried Windows 7 from a USB stick, and it doesn't work. I've tried my old XP disk, and it doesn't work. Why isn't it working?
Because my "ASUS Utility BIOS" doesn't recognize any of them as boot-disks. I literary can't install another system from the only Bios option that I have (I tried running the disks from outside Bios and they instantly encounter an error. I've tried the disk on another computer and they work fine).
What DOES it recognize as a boot-disk, though? My SansaDisk Mp3-player.

So, anyone know any reason why this might be happening?

 

[DoPo]

OK, I'm taking a guess here, but did you disable Secure Boot? I know most (if not all) Windows 8 laptops come with the option enabled by default and it is possible that is preventing the running of another OS from a bootable device. Not sure if it'd do that, though, but it is possible.

 

[Realitycrash]

OK, I'm taking a guess here, but did you disable Secure Boot? I know most (if not all) Windows 8 laptops come with the option enabled by default and it is possible that is preventing the running of another OS from a bootable device. Not sure if it'd do that, though, but it is possible.

I had, but apparently I hadn't disabled some auto-detect option which did..Something. I put it on 'enabled' instead, and managed to boot from my Win 7 disk. Now what happens? I'm not allowed to INSTALL on any partion because they are "GPT-protected" whatever that means, and are of an ESI-format (or maybe it said ESP). I have no idea what either means. I've never encountered such an issue before. I formatted, but it didn't help. Uh, now what? Seriously, on EVERY system and EVERY computer I've ever had (even Mac), it's always been "Format, then install, then go". Never any problem at all.

 

[SnowyGamester]

Did you try deleting the partition before formatting? Or does it not let you do that? If not you should be able to do this:

1 - Open the command prompt recovery on your Windows installation disk
2 - Type "diskpart"
3 - Type "list disk"
4 - Make a note of the Disk Number that you wish to remove the GPT Partition from
5 - Type "select disk 1" if disk 1 is the GPT disk
6 - Type the command "clean"

That should remove all formatting and allow you to create a new partition with whatever.

 

[Realitycrash]

Did you try deleting the partition before formatting? Or does it not let you do that? If not you should be able to do this:

1 - Open the command prompt recovery on your Windows installation disk
2 - Type "diskpart"
3 - Type "list disk"
4 - Make a note of the Disk Number that you wish to remove the GPT Partition from
5 - Type "select disk 1" if disk 1 is the GPT disk
6 - Type the command "clean"

That should remove all formatting and allow you to create a new partition with whatever.

Haven't tried deleting yet. Will do. How do I open command-prompt? As soon as I boot I either go into Bios or right into the Install Windows-menue from the boot-disk.

 

[SnowyGamester]

It's under the recovery option on the Windows installation disk.

 

[Realitycrash]

It's under the recovery option on the Windows installation disk.

It says "This version isn't compatible with the version of Windows you are trying to recover" when I press the recovery option. Then it boots me back into the install-menue. But I don't HAVE a Windows on my computer right now, because I formatted it away. So..Uh..?

Edit: Also, Deleting a partion clearly didn't help either.

Edit 2: I got into Command-prompt from my Windows XP disk, but the only command you described that actually worked as "Disklist". From there I could not execute any other commands but the computer just gave me a list of paritions (there were only one). I could not enter any other command.

Edit 3: Managed to delete all partions from the Windows XP-command prompt, then insert Windows 7 and install. God, what a hassle. Thanks for your help!