Sharepoint 2010 requirements

Hardware requirements
-------------------------
Component Minimum requirement
Processor 64-bit, four cores
RAM 4 GB for developer or evaluation use
8 GB for production use in a single server or multiple server farm
Hard disk
80 GB for system drive
Software requirements
----------------------
Database server in a farm:The 64-bit edition of Microsoft SQL Server 2008 R2.
Single server with built-in database:The 64-bit edition of Windows Server 2008 Standard, Enterprise, Data Center, or Web
Server with SP2, or the 64-bit edition of Windows Server 2008 R2 Standard, Enterprise, Data Center, or Web Server. If you
are running Windows Server 2008 without SP2, the Microsoft SharePoint Products Preparation Tool installs Windows Server
2008 SP2 automatically.
The preparation tool installs the following prerequisites:
-------------------------------------------------
Web Server (IIS) role
Application Server role
Microsoft .NET Framework version 3.5 SP1
SQL Server 2008 Express with SP1
Microsoft Sync Framework Runtime v1.0 (x64)
Microsoft Filter Pack 2.0
Microsoft Chart Controls for the Microsoft .NET Framework 3.5
Windows PowerShell 2.0
SQL Server 2008 Native Client
Microsoft SQL Server 2008 Analysis Services ADOMD.NET
ADO.NET Data Services Update for .NET Framework 3.5 SP1
A hotfix for the .NET Framework 3.5 SP1 that provides a method to support token authentication without transport security
or message encryption in WCF.
Windows Identity Foundation (WIF)
http://technet.microsoft.com/en-us/library/cc262485.aspx