System requirements:
Microsoft® Windows® XP Professional with Service Pack 2 (SP2) or
Microsoft Windows XP Home Edition with SP2.
A 2.0 gigahertz (GHz) Intel Pentium 4, or AMD Athlon, or compatible
processor is required. 3.2 GHz or higher is recommended.
512 megabytes (MB) of RAM or higher is recommended.
An NTFS file system partition with 700 MB of free space is required to
install and run "WinFS" Beta 1.
Mica male... 
Fonte: http://dotnetjunkies.com/WebLog/mikaels/archive/2005/08/29/132216.aspx