Hi Taxen,
Sorry to hear you are having problems, to be able to diagnose your specific issue better we will need a copy of your DxDiags and a zipped up copy of your logs folder.
How to do this can be found here:
That trouble shooting document also covers helpful tips to solve common issues. Please pay careful attention to this section:
A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums.
Please make sure you have run the tests mention in the second link and include the debuglogging flag from the first link before zipping up your logs folder and attaching it here.
Hopefully we should have you running again in now time.