Unity 5.1.0f3 crashing at splash screen

*Unity 5.1.0f3 64bit crashes at the splash screen on Windows 7 Ultimate 64bit, with fault module libcef.dll Unity 5.0.3f2 and 4.6 work perfectly well.* **Tried solutions:** -Launching Unity as admin and/or in compatibility mode. -Launching Unity while pressing the alt key and with -force-d3d11 -Updating all drivers and running DxDiag -Checking Windows DEP settings -Reinstalling & Repairing -Reinstalling on a different partition and physical disk -Uninstalling, deleting Unity registry files, restarting, reinstalling -Uninstalling, Removing the Pace Anti-Piracy license files folder, restarting, reinstalling -Searching for a .ulf file and deleting it in the install disk (none were found) -Using a different installer file -Running CHKDSK on all disks **Hardware:** Asus z67-k Intel i7 4790k Radeon r9 290x 4GB 16GB DDR3 RAM 376Gb minimum free HDD space on possible install disks **Thank you in advance.**