I'd say if you're having problems with GE it'd still be smartest to actually use DDU to remove it as there's clearly something wrong somewhere and GE isn't capable of fixing itself, hence why DDU is needed. And considering DDU is so easy to use it's the best solution.
If you have graphics or driver issues, one of the most common fixes is a clean uninstall and removal of your graphics drivers.
To uninstall your drivers, first download and run Display Driver Uninstaller, and follow it's recommendations of booting into safe mode and ect.
(This is a direct download link so you don't grab the wrong version)
http://www.guru3d.com/files-get/display-driver-uninstaller-download,20.html
You'll download a compressed file called "[Guru3D.com]-DDU.zip"
Right click and choose extract.
Go into the folder and run the DDU v##.##.exe
This will extract more files to this folder.
Run Display Driver Uninstaller.exe
Choose Yes when it asks you to boot into SafeMode.
After you've rebooted into safe mode.
When DDU comes up, if it hasn't selected your GPU manufacturer (Nvidia/AMD/Intel) then choose it from the drop down list
Press the Clean and Restart option
If a window comes up asking to disable the Windows automatic installation of display drivers click yes.
After (or before removing the old drivers, just put the new ones on the desktop or somewhere handy) rebooting back into Windows, manually download the latest drivers from Nvidia or AMD, don't use auto detect, choose you GPU model and OS from the drop down lists.
Nvidia:
http://www.nvidia.com/Download/index.aspx?lang=en-us
AMD:
http://support.amd.com/en-us/download