Can you please reply with the model number of your motherboard?
Besides we need the reference number of the Intel(R) System Identification Utility:
It's a Gigabyte GA-Z68X-UD5-B3
SIU Reference Number: 0063 3133
EDIT: I just uninstalled the RST driver in order to test again using the driver built into Windows but it kept freezing the security feature so a secure erase wasn't possible (yes, I tried turning the drive off and on). It's a shame because that would have been an important test.
Next I went into the motherboard bios and changed the controller mode from AHCI to IDE. Although the security feature was again frozen, I was able to cycle the power on the drive to get around it. The secure erase worked fine and got all the way through without timing out.
I'm going to set it back to AHCI and install the RST drivers again now ready for future testing.