On a computer that is running Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 with a TPM 1.2 chip, you may not be able to clear the TPM with the owner password. This problem occurs if you have any of the following updates installed:
Update KB2920188 is included in the other 3 updates.
This is a known issue introduced by the TPM 2.0 support added by update KB2920188 to Windows 7 and Windows Server 2008 R2.
To clear the TPM without the need to enter the password, follow these steps:
- Click the Start button, type tpm.msc in the Search box, and then click tpm.msc.
- In the TPM Management console, click Clear TPM on the Actions pane.
- Click I do not have the TPM owner password, and then follow the screen instructions.