Hi, We encrypted folder (Which contains Data) in one of my laptop (Lenovo) which contains Vista Enterprise Edition. But today we formatted that system without decrypting the folder and installed Window 7 Enterprise Edition.Now how to decrypt that data.The data is in D:\ Drive. Please help me.

This depends on how you encrypted the information (it sounds like EFS in your description) and if you have a recovery agent in place. Assuing you are using EFS to encrypt the folder you would have had the decryption key saved locally. There is a possibility that you via Group Policies set a so called recovery agent, meaning that another user can decrypt the information. If you did a complete format of the disk when installation Windows 7 the local key is gone, but if you did not format the disk and just installed Windows 7 on the same partition you might be able to retrieve the decryption key from c:\Windows.old.Blogging about Windows for IT pros at www.theexperienceblog.com