Zitat von gpvecchi im Beitrag #14

---

Yup, I don't have another EFI OS, I was using XP...

---

Windows XP does neither support GPT nor the UEFI mode!
This is what you can read at the Rufus web page to which I previously have given you the link (>here< is it again):

"Notes on UEFI & GPT support:
Since version 1.3.2, Rufus support UEFI as well as GPT for installation media, meaning that it will allow you to install Windows 7, Windows 8 or Linux in full EFI mode.
However, Windows Vista or later is required for full UEFI/GPT support. Because of OS limitations, Windows XP restricts the creation of UEFI bootable drives to MBR mode."

Conclusion: Your thread title is absolutely misleading.

Zitat von gpvecchi im Beitrag #17

---

So, to install W7/8/8.1 in a pc with modded OROM and no DVD I need a pc with W7/8/8.1 installed. Thanks Microsoft!

---

That is not true.
You can install Win7 and Win8.1 onto any PC, which is supported by these Operating Systems, and you do not need a running Win7/8.1 system for the preparation of a bootable DVD/USB flash drive, which allows you an installation of Win7 or Win8.1 in UEFI mode.
Furthermore it is completely irrelevant, if the Intel RAID ROM module of the BIOS is modded or not.
The only thing, which is impossible, is the installation of Windows XP in UEFI mode.