how can i uninstall deep freeze with no password?

After you open Disk Utility:

Drive Preparation

1. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.

2. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.

3. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.

4. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.

5. Click on the Erase button. The format process can take up to several hours depending upon the drive size.

BTW, if Lion did not come pre-installed and you have a Snow Leopard DVD, then you can boot from the Snow Leopard DVD to do the above.

Try contacting the Deep Freeze tech support. If you are referring to a password for OS X, then please provide more detail.

I believe that if you re-partition and erase the drive first, then install Mountain Lion that would rid the computer of the Faronics software. But I don't know this from experience. I've tried the Faronics product but never had your issue.