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Windows Vista Beta 2 attempt 2 Toshiba Satellite 

Q. What is required to run Windows Vista?
A. If you purchased a PC in the last two years, chances are good that you can run Windows Vista today. To install and run the core functionality of Windows Vista, you need:

An 800 MHz processor
512 MB of RAM
A 20 GB hard drive with 15 GB of free space

http://www.microsoft.com/windowsvista/getready/upgradeadvisor/faq.mspx