Take a look at some of the other posts about 2.8.5 - there are some 'known' problems. Downloading the same version again will not help.

I downgraded to 2.7.3 to get rid of some of the 'new features'.
I de-installed 2.8.5 first; then did a clean install of an old 2.7.3 version). Things are a lot more stable now, although there are still a lot of 2.8.5 copies out there...

Werner.