Windows Vista Hardware Requirements
Microsoft has published the requirements for Windows Vista OS.
Take these requirements into consideration before you buy a new PC or while perfroming a system upgrade!
A PC with minimum requirements cannot support the "AERO" interface, which forms all the glassy and eye catchy part of VISTA.
A PC with recommended requirements alone can run VISTA in its full glory.
Minimum Requirements (Vista-Capable PCs):
--800 MHz Intel-compatible processor
--512MB of RAM
--DirectX 9.0-Capable Graphics Processor
--20GB HD
http://www.microsoft.com/windowsvista/getready/systemrequirements.mspx
Recommended Requirements (Premium-Ready PCs):
--1 GHz Intel-compatible processor
--1GB RAM
--DirectX 9.0-Capable Graphics Processor, with 128MB graphics memory. (64MB of graphics memory to support a single monitor less than 1,310,720 pixels [no more than 1440x900]; 128MB of graphics memory to support a single monitor at resolutions from 1,310,720 to 2,304,000 pixels [no more than 1920x1200]; 256MB of graphics memory to support a single monitor at resolutions higher than 2,304,000 pixels [more than 1920x1200]).
--40GB HD with at least 15GB "free space"
http://www.microsoft.com/windowsvista/getready/capablefootnotes.mspx
