I've downloaded the 10.5 program last month and haven't had any problems until now. I just tried starting up one of the programs (ArcMap, ArcCatalog etc.) and it just stays on the initialization screen. I've tried uninstalling and re-downloading the program, but I still get the same issue. I have a Windows 10 operating system that I've been using since last February with ArcGIS 10.4 and haven't had issues with that. If anyone can help me out that would be great.