when i want to start the UE4 a stronk error appaers and i dont know the Reason
MachineId:FE8240B0464B5593ACFB4EBFDF7A4ADA
You do not have any debugging symbols required to display the callstack for this crash.
so i dont know what happend
-How do you start the engine? -> start it from the launcher or from a uproject file.
-Which engine version do you use?
-make sure to post this on answerhub: https://answers.unrealengine.com/index.html 
just ran into this problem with a friend in hangouts, if you use the launcher and not source try this:
click the down arrow next to the engine version and click verify, once it finishes restart your computer. that fixed it for him
@ fighter
- i start the engine by the launcher, because i didn´t have any project - it´s my first time
- latest 4.8 i download it yesterday
- done
@ CNKIT
- i dont found this arrow :(?
In the library tab you can see the different versions. There you can also find this arrow
you mean this?
If i want to login it fails! I dont get this window ^^
Hi bastimw,
&stc=1
This should be what you are looking for. Additionally, please post this to the answerhub if this does not address the error. You can find this at http://answers.unrealengine.com and should post in the bug reports section. Thank you!
Here is the link to the answerhub post: UE Launcher doesent work - Programming & Scripting - Unreal Engine Forums
ok Problem first time solved 
nothing of these Ideas worked - so i try to start the launcher in the Debugging Mode.
The Problem was i only see the login not the launcher overview, and the login crashes.
I look to these Log-Textfile and see that there is a Problem with Teamspeak 3 Overlay, when i close Teamspeak it´s working - thanks for help!