Deus Ex Alpha

When I was mapping on UE, I finished a map. When I tried starting up the UE again, it gave me a gpf. I kept trying to go in about 5 times and still a gpf. I uninstalled and reinstalled 2 times, and defragged my system and cleaned it up, and I still get a gpf! Could anyone help me if they know the problem? Thanks.

Get a different version of UE or a different version / new installation of DX.

Id prefer not to reinstall again, but if I must i'll try it, Thanks.