Mod Edit: Split from http://www.bleepingcomputer.com/forums/t/354475/updates-failed-to-install/ - Hamluis.
I have the very same problem "Error opening installation log file. Verify that the specified log file location exists and is writable."
I use AVG Free and Win Defender disabled.
Nothing I found on the internet so far solved the problem.
Edited by hamluis, 23 April 2014 - 08:36 AM.
PM sent new OP - Hamluis.