I went to install Sharepoint Designer 2013 (32 bit) today and got this error:
First, I tried a reboot and install again but no difference. Then I had a look here:
And saw something about ‘WebRoot Spysweeper’. I use AVG Internet Security Network Edition and wondered if disabling this would make any difference. As a habit, I don’t usually disable AVG when installing stuff despite that most instructions tell you to. Anyhow, I disabled AVG for 10 minutes and tried installing SPD2013 again. Guess what. It worked! Perhaps, I’ll start heeding those instructions some more.