With the public release of the Windows 7 RC looming near, Microsoft has announced the Windows 7 system requirements. To run Windows 7 your computer will need at least a 1GHz 32 bit (x86) or 64 bit (x64) CPU, 1GB (32 bit) or 2GB (64 bit) of memory, 16GB (32 bit) or 20GB (64 bit) of hard drive space and a DirectX 9 compatible graphics card with Windows Display Driver Model 1.0 or higher. If you plan to use XP Mode you'll need at least 2GB of RAM, 15GB of additional disk space and a CPU which supports chip level virtualization. These required specifications are more than needed for Vista but a relatively modern PC purchased in the last few years should be able to run Windows 7 with no problems. Microsoft have also released their "Compatible with Windows 7 Logo" but it isn't known yet what criteria are needed to attain the sticker, but I'd expect them to be pretty close if not the same to the Windows 7 minimum requirements.