If you truly need Windows 7 functionality on Android, consider:
Not all Windows 7 ISOs are created equal for emulation. If you download a standard 64-bit Windows 7 Home Premium ISO (roughly 3.2 GB), Limbo will likely crash or take 45 minutes to boot. Windows 7 Iso Limbo Pc Emulator
Because Limbo emulates x86 architecture on ARM (mobile) processors, Windows 7 will run very slowly. Boot times can exceed 10–20 minutes. ISO Source: If you truly need Windows 7 functionality on