Hi TakeTimeGames,
Can you provide a little bit of information for us about your machine specs?
Since you are experiencing a crash, can you please provide us with the .LOG and .DMP files from your [project]\Saved\Logs folder.
Additionally, you can please send us the CrashReportClient.log file located in C:\Program Files\Unreal Engine\4.0\Engine\Programs\CrashReportClient\Saved\Logs.
Also, in your message you indicated you had upgrade to 4.1 but were going back to open 4.0.2. Is the 4.1 update crashing for you as well or is it just 4.0.2 that is doing that? When you open 4.0.2 are you opening one of the sample contents or just the launching the editor?
Thanks for any information you can provide!
Tim