Visual Studio 2019 Un-runnable

I reinstalled several times and even older versions of 2019, pro, enterprise. Nothing works. The result is the same:

And this is what I see in Event Viewer:

Faulting application name: devenv.exe, version: 16.7.30406.217, time stamp: 0x5f2ced7a Faulting module name: KERNELBASE.dll, version: 10.0.19041.388, time stamp: 0xa2224bb6 Exception code: 0xc000041d Fault offset: 0x00129862 Faulting process id: 0x1418 Faulting application start time: 0x01d6710516048bbd Faulting application path: C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\devenv.exe Faulting module path: C:\Windows\System32\KERNELBASE.dll Report Id: f8e47ec2-8602-487b-b660-503b53eed681 Faulting package full name: Faulting package-relative application ID:

And this on the .Net Runtime errors(top of a long stack trace):

Application: devenv.exe Framework Version: v4.0.30319 Description: The process was terminated due to an unhandled exception. Exception Info: StreamJsonRpc.RemoteInvocationException at StreamJsonRpc.JsonRpc+d__118`1[[Microsoft.ServiceHub.Framework.RemoteServiceConnectionInfo, Microsoft.ServiceHub.Framework, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task) at Microsoft.ServiceHub.Client.HubClient+RemoteServiceBrokerWrapper+<>c__DisplayClass9_0+<b__0>d.MoveNext() at Microsoft.ServiceHub.Client.HubClient+RemoteServiceBrokerWrapper+<>c__DisplayClass9_0+<b__0>d.MoveNext() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(

Note: VS2017 runs fine, which is what I'm using for the time being but several projects are on VS2019 and I need the machine to get back to VS2019. This is the first I've seen of so badly screwed Visual Studio installation.