Clear the TPM
Applies To: Windows 7, Windows Server 2008 R2
Clearing the Trusted Platform Module (TPM) resets the TPM to an unowned state. After clearing the TPM, you need to complete the TPM initialization process before using software that relies on the TPM, such as BitLocker Drive Encryption.
Clearing the TPM can result in the loss of data. To avoid data loss, make sure you have a backup or recovery method for any data protected or encrypted by the TPM.
After the TPM is cleared, it is also turned off.
To temporarily suspend TPM operations, turn the TPM off instead of clearing it. For more information, see Turn the TPM On or Off.
Membership in the local Administrators group, or equivalent, is the minimum required to complete this procedure.
To clear the TPM
Click Start, click All Programs, click Accessories, and then click Run.
In the Open box, type tpm.msc, and then press ENTER.
If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Yes.
Under Actions, click Clear TPM. If the TPM is off, follow the procedure Initialize the TPM to reinitialize it before clearing it.
Clearing the TPM resets it to factory defaults and turns it off. You will lose all created keys and data protected by those keys.
In the Clear the TPM Security Hardware dialog box, select a method for entering your password and clearing the TPM:
If you have the removable media onto which you saved your TPM owner password, insert it, and click I have a backup file with the TPM owner password. In the Select backup file with the TPM owner password dialog box, use Browse to navigate to the .tpm file saved on your removable media. Click Open, and then click Clear TPM.
If you do not have the removable media onto which you saved your password, click I want to type the TPM owner password. In the Type your TPM owner password dialog box, enter your password (including hyphens), and click Clear TPM.
If you do not know your TPM owner password, click I don't have the TPM owner password, and follow the instructions provided to clear the TPM without entering the password.
If you have physical access to the computer, you can clear the TPM and perform a limited number of management tasks without entering the TPM owner password.
The status of your TPM is displayed under **Status** in TPM Management.