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System Requirements are crutial to running Windows 7. If your computer doesn't meet them, you will be unable to use Windows 7.

Windows 7 Requirements
32bit (x86) 64bit (x64)
1GHz or faster proccessor 1GHz or faster proccessor
1GB RAM 2GB RAM
16GB HD free space 20GB HD free space
DirectX 9 graphics & WDDM 1.0 or higher driver

Some features in Windows 7 have additional requirements. The following table states some of these requirements.

Windows 7 Additional Requirements for Certain Features
Additional Requirements
Internet access
TV Tuner for Media Center TV reception
HomeGroup requires a network and a PCs with Windows 7
BitLocker requires Trusted Platform Module 1.2
BitLocker To Go requires a USB drive
XP Mode requires another 1GB RAM, 15GB HD, and a virtualization capable proccessor with Intel VT or AMD-V on

If you want to check and see if your PC will have any hardware or software problems, download the Windows 7 Upgrade Advisor from Microsoft's website.