Cannot install MSE - error 0x80070643

The scan finished with one warning about a 'PossibleHostsFileHijack' but I have manually edited the hosts file, so no worries there.
 

My Computer My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom build
OS
Windows 7 Ultimate x64
CPU
Intel i7 3770K @ 3.5 GHz
Motherboard
Gigabyte Z68X-UD3h-B3
Memory
2x4GB @ 1366 MHz
Graphics Card(s)
Gigabyte GTX 670 2GB
Sound Card
Onboard Sound
Monitor(s) Displays
BenQ GL2450 24"
Screen Resolution
1920x1080
Hard Drives
Samsung 840 EVO 500GB | WD Caviar Blue 500GB
PSU
OCZ ModXStream Pro @ 700W
Case
CM Storm Enforcer
Cooling
Fan cooled
Keyboard
Razer Blackwidow Ultimate 2013
Mouse
Razer Deathadder 2013
Internet Speed
2.5 Mbps
Antivirus
--None--
Browser
Google Chrome
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