Windows Search, DISM and Task Scheduler are not working

Hello,

Today, I have a few problems, for which I need help.

1. DISM
2. Windows Search
3. Task Scheduler
4. Clean Upgrade Problem
5. DISM, the Deployment Image Servicing and Management Tool isn't working for me. It usually throws the error 0x800f081f for no Source Files found. To fix that, I made an ISO with Media Creation Tool, and mounted it to use it as a Source. But, when I ran DISM /Online /Cleanup-Image /RestoreHealth /Source:ESD:H:\sources\install.esd, it still shows the same error that the Source Files are not found.
6. My Windows Search isn't working since a few days. I've ran sfc /scannow thrice, I couldn't use DISM due to the above reason, and ran chkdsk on all my partitions thrice. I did some "basic" research, and found that there was no Search Process, Cortana Process running to be shown in my Task Manager. I also ran the troubleshooter, which found "No Problems", and reset my Windows Search with the PowerShell Script here. I also manually reset Cortana and Search (again) from the Windows Settings and also tried the ctfmon.exe

My Windows Service is running normally, no errors even when I restart it. I've also rebuilt my search index, but of no avail. I also found a Powershell Command in this website, which did not work but spit errors out. Commands ran and screenshots below

a. Get-AppXPackage -AllUsers |Where-Object {$_.InstallLocation -like "*SystemApps*"} | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

3. Whenever I try to open Task Scheduler, I get this error. https://i.imgur.com/G3W8LT3.gif Other MMC apps like Disk Management work.

The error stack:

`

FX:{c7b8fb06-bfe1-4c2e-9217-7a69a95bbac4}

Could not load file or assembly 'TaskScheduler, Version=10.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The module was expected to contain an assembly manifest.

   at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)

   at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)

   at System.Activator.CreateInstance(String assemblyString, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo, StackCrawlMark& stackMark)

   at System.Activator.CreateInstance(String assemblyName, String typeName)

   at System.AppDomain.CreateInstance(String assemblyName, String typeName)

   at System.AppDomain.CreateInstanceAndUnwrap(String assemblyName, String typeName)

   at Microsoft.ManagementConsole.Internal.SnapInClient.CreateSnapIn(String assemblyName, String typeName)

   at Microsoft.ManagementConsole.Internal.ClassLibraryServices.Microsoft.ManagementConsole.Internal.IClassLibraryServices.CreateSnapIn(String assemblyName, String typeName)

   at Microsoft.ManagementConsole.Executive.SnapInInitializationOperation.OnStart()

   at Microsoft.ManagementConsole.Executive.RunningOperationsTable.EnqueueOperation(Operation operation)

   at Microsoft.ManagementConsole.Advanced.FrameworkSnapInFactory.Microsoft.ManagementConsole.Advanced.ISnapInFactory.CreateSnapIn(Int32 bookkeepingId, String snapInKey, Object& snapIn)

`

4. Yesterday night, fed up of all these problems, I tried a Clean Upgrade using my Windows 10 ISO. Again, to my disappointment, I got this. It showed that it couldn't upgrade with saving my data, apps. The same happened when I tried it through the Media Creation Tool. Screenshot below

I do not want to go through the pain of Clean Install or a Reinstall, so please suggest me a few methods to fix it.

Thank you