Are u still confused about which edition of Windows 7 to use? Here is some information on the same.

Windows 7 Professional

This edition is targeted towards enthusiasts and small business users. It includes all the features of Windows 7 Home Premium, and adds the ability to participate in a Windows Server domain. Additional features include operating as a Remote Desktop Server, location aware printing, Encrypting File System, Presentation Mode, Software Restriction Policies (but not the extra management features of AppLocker) and Windows XP Mode.

Windows 7 Enterprise

 This edition targets the enterprise segment of the market and is sold through volume licensing to companies which have a Software Assurance contract with Microsoft. Additional features include support for Multilingual User Interface (MUI) packages, BitLocker Drive Encryption and Unix application support. Not available through retail or OEM Channels , this edition is distributed through Microsoft Software Assurance (SA). As a result it includes several SA-only benefits, including a license allowing the running of multiple virtual machines and activation via VLK.

Check the links below to clarify all your doubts.

 http://windows.microsoft.com/en-IN/windows7/products/compare 

 http://en.wikipedia.org/wiki/Windows_7_editions  

Your comments are also welcome.