I have Win7 x64 Home OEM installed on my MSI notebook. I wonder if I can change it to Win7 x86 Pro or Ultimate. I have Win7 Home X64 DVD but I have not Win7 x86 Pro or Ultimate for my notebook. I have Win7 x86 Pro DVD from Dell notebook. Is it possible to install Win x86 Pro using DELL DVD that I have on MSI notebook?