Disconnect your PC from the internet (wired & wireless). Turn off all firewall, anti-virus, and anti-malware stuff. Navigate to setup.exe.
If this works, don't install to Program Files or Program Files(x86)! Select a hassle-free directory such as "Taldren".
I have a Windows 7, 64-bit laptop. I have disabled User Access Control, so I rarely have to deal with annoying authority issues. Good luck.