Yesterday everything worked fine, today the launcher doesn't work anymore. That could be either because of the hotfix that I installed yesterday, or because of the new windows 10 update, which I installed over night. I think the cause of this is the windows update, since I could play perfectly fine after I installed the hotfix yesterday.
The problem I had: c0000005 error appeared after I click on the "play button" of the launcher before the game was started.
So I followed the instructions on how to disable DEP. Then I pressed the play button again. First the screen got dark, then the same error appeared. (YAY! It's something
Then I read here that -skiptobnet is probably the cause of that, so I disabled that feature. Game starts normally. If I press SP and load my characters, everything works fine. No errors. However, if I click on "multiplayer" the same error (c0000005) appears again when the game says "checking for version".
Then I tried to change the video mode from Glide to the other 2 video modes - no change. I ran the video test - no change. The problem still occurs.
I have no previous versions of the launcher installed, and I'm using the latest launcher.