http://msdn.microsoft.com/vstudio/support/readme/

System Requirements for Installing Visual Studio 2005
Processor Minimum:
  • 600 megahertz (MHz) Pentium processor

Recommended:

  • 1 gigahertz (GHz) Pentium processor recommended
Operating System Visual Studio 2005 can be installed on any of the following systems:
  • Microsoft® Windows® 2000 Professional SP4
  • Microsoft® Windows® 2000 Server SP4
  • Microsoft® Windows® 2000 Advanced Server SP4
  • Microsoft® Windows® 2000 Datacenter Server SP4
  • Microsoft® Windows® XP Professional x64 Edition (WOW)
  • Microsoft® Windows® XP Professional SP2
  • Microsoft® Windows® XP Home Edition SP2
  • Microsoft® Windows® XP Media Center Edition 2002 SP2
  • Microsoft® Windows® XP Media Center Edition 2004 SP2
  • Microsoft® Windows® XP Media Center Edition 2005
  • Microsoft® Windows® XP Tablet PC Edition SP2
  • Microsoft® Windows Server™ 2003, Standard Edition SP1
  • Microsoft® Windows Server™ 2003, Enterprise Edition SP1
  • Microsoft® Windows Server™ 2003, Datacenter Edition SP1
  • Microsoft® Windows Server™ 2003, Web Edition SP1
  • Microsoft® Windows Server™ 2003, Standard x64 Edition SP1 (WOW)
  • Microsoft® Windows Server™ 2003, Enterprise x64 Edition SP1 (WOW)
  • Microsoft® Windows Server™ 2003, Datacenter x64 Edition SP1 (WOW)
  • Microsoft® Windows Server™ 2003 R2, Standard Edition
  • Microsoft® Windows Server™ 2003 R2, Standard x64 Edition (WOW)
  • Microsoft® Windows Server™ 2003 R2, Enterprise Edition
  • Microsoft® Windows Server™ 2003 R2, Enterprise x64 Edition (WOW)
  • Microsoft® Windows Server™ 2003 R2, Datacenter Edition
  • Microsoft® Windows Server™ 2003 R2, Datacenter x64 Edition (WOW)
  • Microsoft® Windows Vista™

 Installation of Visual Studio 2005 on the Intel Itanium (IA64) is not supported.
RAM1 Minimum:
  • 192 megabytes (MB)

Recommended:

  • 256 MB
Hard Disk2 Without MSDN:
  • 2 GB of available space required on installation drive
  • 1 GB of available space required on system drive

With MSDN:

  • 3.8 GB of available space required on installation drive with a full MSDN install or
    2.8 GB of available space required on installation drive with a default MSDN install.
  • 1 GB of available space required on system drive
CD or DVD Drive Not required
Display Minimum:
  • 800 x 600 256 colors

Recommended:

  • 1024 x 768 High Color - 16-bit
Mouse Microsoft mouse or compatible pointing device