I bought a netbook Asus 1225B with preinstalled Asus Express Gate without Microsoft OS. I installed Windows 7 Professional x64, removing all partition made by manufacturer. An instalation and activation with moded BIOS, cert and SLP worked perfectly. Finally I got two partitions: C, with OS and D - mede by me for recovery or any future purpose. Bot are NTFS. I downloaded Windows 8 (upgrade offer) and made instalation disc on my Kingston 16 GB pendrive, the same I used to install windows 7. When I try to install on D partition I got a message: "Windows cannot be installed to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks". Also I cannot install on C - the message is the same. When I removed both partition and a space reserved for the system (100MB) I could do a clean install of Windows 8 without any problems, but I could not install if the Windows 7 is installed on C: Is it possible to make dual boot on my netbook? Is EFI responsible for it? Any idea how to resolve this problem?