"This is crazy!!! I copied your batch file, ran it exactly the same way and it won't activate the TPM. I'm about to loose my mind over this problem. It should be so simple...I must be missing one small piece to the puzzle...but where?"This is your Optiplex 755 with A17 BIOS correct? Try loading BIOS defaults and activating it manually then clearing the TPM and see if it can set it then? Not sure what else to suggest on that model. If it still doesn't work I could see if we have another spare 755 in the build room that I can verify on to make sure it works on more than this one device for whatever reason.