To simplify, I've recorded a VIDEO of the problem:
http://youtu.be/PlGNl09rkawI've tried rebooting, re-downloading the patch, updating through avast "update program" interface, scannning the PC for threats with both avast and malwarebytes, running as admin, etc... no change.
PC:
CPU: i7 930 (3,8GHz)
MB: Gigabyte GA-X58A-UD3R
RAM: 3x2GB DDR3 1600MHz 8-8-8-24 Corsair
HDD: Intel 320 120GB SSD, 2x320GB Seagate (Raid0), 1x500GB Seagate
PSU: Corsair VX650W
CASE: NZXT Hush
OS: Win7 x64 SP1, updated
USER: Advanced user (system admin) with 15 years of experience, 100% stable PC.
Install log:
http://www.sendspace.com/file/veeuc8