The utility is very useful but unfortunately it will not be included in the Home Premium Editions of Windows 7. Better go to the Ultimate version to get this function.
Anyway, How to Turn-Off the Encryption afterwards?
Quick Information
BitLocker Drive Encryption is a security in Windows 7 Ultimate and Enterprise edition designed to help protect data from being accessed or opened by unauthorized users.
Unlocking the Encrypted Drive
1.Simply type “BitLocker” in Start Menu Search
2.Open the BitLocker Drive Encryption Program
3. Once it opens, just find the drive and click "Turn Off BitLocker”
It will ask for a confirmation: “Your drive will be decrypted. This may take considerable time. You can monitor the status of your drive decryption.”
4.Just proceed by clicking Decrypt Drive
5.Done