Install windows 8 in GPT style hard disk

I guess the original poster is not going to change his mind about the conversion after reading my post :-) But since the question is up-voted, here are some hints:

The first partition is more likely to be a Windows-specific "system" partition, particularly if it is NTFS-formatted (the EFI partition should be FAT-formatted to be useful to the largest number of systems.)

EFI systems using MBR-formatted disks often boots using "legacy mode" (Compatibility Support Module), so to all effects, they appear to the OS as BIOS systems, not as EFI ones. In the case of Windows, the boot process of the operating system itself, after the boot manager, is a bit different (winload.exe against winload.efi); so fiddling with it is a bit risky. In addition, you need to add a EFI system partition which is presently missing (although reconverting the SYSTEM_DRV can be used for that purpose, it is not straightforward.) Furthermore, the recovery system provided by the vendor will blindly assume the computer operated in BIOS mode, so running it even by accident is likely to make things worse, not better: so it should be removed, which means removing one more safety mechanism in case something unexpected happens.

Since BIOS is better understood than EFI, it is therefore recommended to either consider the system as a purely dispensable experimentation machine (and then it is easier to start from scratch); or to stay with the original MBR formatting and BIOS booting.

From Resolving the dreaded Windows 8 0xC0000225 error :

I've had this happen to me twice, all of a sudden Windows 8 refuses to boot and gives an error code of 0xC0000225 (or something) and anything you do won't fix it. The problem is that since for whatever reason Windows thinks there's no bootloader, it refuses to boot. Period. You can't even go into the recovery environment, which is my biggest complaint at Microsoft.

In any case, there's one way I've found to resolve this. If you have access to another computer, take out the affected computer's primary drive and find a way to mount it in the system (internally, externally, whatever). Then do the following:

• Open command prompt as an administrator
• Type in "diskpart"
• Type in "list disk". Find out which disk the affected drive is.
• Type in "select disk #", where # is the affected drive's number
• Type in "list partition", find the partition number of the system partition (it's usually 100MB, 200MB, or 300MB), then type in "select partition #", where # is the system partition's number.
• Type in "assign letter=z", assuming you don't have a Z: drive.
• Exit out of diskpart by pressing CTRL+C
• Type in BCDBoot [Drive letter of affected drive's Windows partition]:\Windows /S Z: /F UEFI So if the affected drive's Windows partition is say G:\, you would type in BCDBoot G:\Windows /S Z: /F UEFI

It should fix the bootloader. If you can get into a recovery environment on the affected computer, then this should work as well.