4.6.1 Failing to Launch

I have re-installed, deleted all known folders in ProgramData and AppData/Local, and I still cannot launch 4.6.1. There was an issue with the older launcher where if I had 4.6.1 installed, I couldn’t click on Library without the launcher crashing, but deleting the Manifest for it solved that. The new launcher doesn’t crash but every time I try to launch the engine (with or without a project) it crashes.

GPU: GTX970 w/ latest drivers

CPU: Intel Core i7 950

RAM: 24GB DDR3

Crash Reporter Info:
Unknown exception - code 00000001 (first/second chance not available)

Assertion failed: InCompressedData != NULL [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.6\Engine\Source\Developer\ImageWrapper\Private\ImageWrapperBase.cpp] [Line: 69]

KERNELBASE + 37901 bytes
UE4Editor_Core + 3092349 bytes
UE4Editor_Core + 1597688 bytes
UE4Editor_Core + 1479058 bytes
UE4Editor_ImageWrapper + 70028 bytes
UE4Editor_ImageWrapper + 70526 bytes
UE4Editor_SlateRHIRenderer + 396831 bytes
UE4Editor_SlateRHIRenderer + 332743 bytes
UE4Editor_SlateCore + 429018 bytes
UE4Editor_SlateCore + 445322 bytes
UE4Editor_SlateRHIRenderer + 299345 bytes
UE4Editor_Slate + 824571 bytes
UE4Editor_Slate + 938914 bytes
UE4Editor!FEngineLoop::Tick() + 4010 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launchengineloop.cpp:2239]
UE4Editor!GuardedMain() + 479 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launch.cpp:131]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

Figured out the solution finally, there’s old stuff left by the previous launcher that was in the folders %userprofile%/AppData/Local and C:\ProgramData. After deleting every Unreal related folder, then uninstalling/reinstalling the launcher and engine, everything is working again.