The minimum hardware requirements for Windows XP Professional include:
- Pentium 233-megahertz (MHz) processor or faster (300 MHz is recommended)
- At least 64 megabytes (MB) of RAM (128 MB is recommended)
- At least 1.5 gigabytes (GB) of available space on the hard disk
- CD-ROM or DVD-ROM drive
- Keyboard and a Microsoft Mouse or some other compatible pointing device
- Video adapter and monitor with Super VGA (800 x 600) or higher resolution
- Sound card(opt)
- Speakers or headphones (opt)
- 800-megahertz (MHz) 32-bit (x86) processor or 800-MHz 64-bit (x64) processor
- 512 megabytes (MB) of system memory
- DirectX 9-class graphics card
- 32 MB of graphics memory
- 20-gigabyte (GB) hard disk that has 15 GB of free hard disk space
- Internal or external DVD drive
- Internet access capability
- Audio output capability
Windows Vista Home Premium, Windows Vista Business, Windows Vista Enterprise, and Windows Vista Ultimate
- 1-gigahertz (GHz) 32-bit (x86) processor or 1-GHz 64-bit (x64) processor
- 1 GB of system memory
- Windows Aero-capable graphics card
Note This includes a DirectX 9-class graphics card that supports the following:
- A WDDM driver
- Pixel Shader 2.0 in hardware
- 32 bits per pixel
- 128 MB of graphics memory (minimum)
- 40-GB hard disk that has 15 GB of free hard disk space (the 15GB of free space provides room for temporary file storage during the install or upgrade.)
- Internal or external DVD drive
- Internet access capability
- Audio output capability
Windows 7 system requirements
If you want to run Windows 7 on your PC, here's what it takes:
- 1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor
- 1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)
- 16 GB available hard disk space (32-bit) or 20 GB (64-bit)
- DirectX 9 graphics device with WDDM 1.0 or higher driver
Additional requirements to use certain features:
- Internet access (fees may apply)
- Depending on resolution, video playback may require additional memory and advanced graphics hardware
- Some games and programs might require a graphics card compatible with DirectX 10 or higher for optimal performance
- For some Windows Media Center functionality a TV tuner and additional hardware may be required
- Windows Touch and Tablet PCs require specific hardware
- HomeGroup requires a network and PCs running Windows 7
- DVD/CD authoring requires a compatible optical drive
- BitLocker requires Trusted Platform Module (TPM) 1.2
- BitLocker To Go requires a USB flash drive
- Windows XP Mode requires an additional 1 GB of RAM and an additional 15 GB of available hard disk space.
- Music and sound require audio output
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