HAXM installation failure on Windows 7

I have an Intel i5-3570K @ 3.4GHz and an Asus P8Z77-V LK motherboard with 16GB of RAM. The Intel Processor Identification Utility reports:

Execute Disable Bit: Yes

Intel(R) Virtualization Technology: Yes

In the BIOS I have Intel Virtualization and Execute-Disable Bit Capability enabled and I am running the BIOS version 0403.

The message I am getting is:

'This computer meets the requirements for HAXM, but Intel Virtualization (VT-x) is not turned on. HAXM cannot be installed until VT-x is enabled. Please refer to the Intel HAXM documentation for more information.'

The first time I attempted the installation Intel Virtualization was not turned on. I have enabled it in the BIOS, shut the system down for 10 minutes with power removed, and reattempted the installation several times with the same error message.

I have attached the HAXM install log and the complete Processor Identification Utility report.

I'm at a loss where to go next.