Go through the Video in Below Link:
http://edge.technet.com/Media/Installing-Win7-using-a-USB-Stick/
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http://edge.technet.com/Media/Installing-Win7-using-a-USB-Stick/
http://www.microsoft.com/windows/enterprise/videos/mdop_sa.asx
http://technet.microsoft.com/hi-in/windows/dd320282(en-us).aspx
The Microsoft Assessment and Planning is an agent less toolkit that will find computers on a network and perform a detailed inventory of the computers using Windows Management Instrumentation (WMI), the Remote Registry Service, or the Simple Network Management Protocol (SNMP). The data and analysis provided by this toolkit can significantly simplify the planning process for migrating to Windows Vista®, Microsoft Office 2007, Windows Server® 2008, Microsoft Application Virtualization 4.5 (formerly SoftGrid), Microsoft SQL Server 2008, Microsoft Online Services, Forefront and Network Access Protection, Windows Server 2008 Hyper-V, and Virtual Server 2005 R2. Assessments for Windows Server 2008 and Windows Vista also include device driver availability and recommendations for hardware upgrades that may be required.>1.6-GHz or faster processor minimum (dual-core for Windows Vista)
> 1.5 GB of RAM minimum (2.0GB for Windows Vista)
> 1 GB of available hard-disk space required
>10/100 Mbps network adapter required
For more Details:
http://technet.microsoft.com/en-us/library/bb977556.aspx
For Downloading MAP Toolkit:
http://www.microsoft.com/downloads/details.aspx?FamilyID=67240b76-3148-4e49-943d-4d9ea7f77730&displaylang=en
Hardware requirements