Microsoft announced system requirements of the Release Candidate for Windows 7. Also the system requirements for RC will be the same as for final versions of the Windows 7.The system requirements for Windows 7 are not so high. For example, users who have already upgraded to a Windows Vista-tailored machine will not need to accommodate for Windows 7.
So if you want to install newest operation system from Microsoft your computer should be powered by 1GHz or faster 32-bit(x86) or 64-bit (x64) processor. Also you should have 1 GB of RAM (32-bit)/ 2 GB of RAM (64-bit), 16 GB free space of available disc space. Your machine must support DirectX 9 graphics device with Windows Display Driver Model 1.0 or higher.
But if you want to install Windows 7 XP Mode you should have really powerful machine. It includes powerful processors, a big capacity disks, powerful video cards and 4 GB of RAM.
