Where it happens: Unity 5.5, Unity 2017 (same symptoms) OS: Windows 10 As the title says, when I try to open up Unity, the main form will open up fine prompting me to create a new project or open an existing. When I try to open an existing, it closes down the form and the editor never returns. Task Manager shows Unity Editor running in the background for about 4-5 seconds, then its Disk, Network, and CPU all drop to 0 and it just sits there. Going into the log found in AppData it always freezes at this point: Registered platform support modules in: 0.0463381s. Native extension for WindowsStandalone target not found Validating Project structure ... 0.000116 seconds. Refresh: detecting if any assets need to be imported or removed ... Refresh: elapses 0.001736 seconds (Nothing changed) No errors detected in the log. Its stuck on trying to detect assets. Anti Virus was uninstalled. Windows Defender is disabled. I have uninstalled 5.5 and reinstalled 2017 and it gives me the exact same issue. Cannot find a suitable solution on the forums. Any help?