Unable To Create New Project In UE 4.21

Hello, I have just recently installed UE 4.21 and I am trying to create a new project. When the project screen opens and asks me to create a new name and folder location all is ok from there. As soon as I press the create Project button, I keep getting an error and have no idea what is causing this. I have tryed the Verify option to see if there were problems, nothing seems to happen to stop this crash. Here is the Error I keep getting. Any one know how to solve this?

An error occurred while trying to generate project files.

Running C:/Program Files/Epic Games/UE_4.21/Engine/Binaries/DotNET/UnrealBuildTool.exe -projectfiles -project=“C:/Users/bjahn/Documents/Unreal Projects/Aysel_Keep 4.21/Aysel_Keep/Aysel_Keep.uproject” -game -rocket -progress
ERROR: UnrealBuildTool Exception: System.UnauthorizedAccessException: Access to the path ‘C:\Users\bjahn\AppData\Local\UnrealEngine\XmlConfigCache-C+Program Files+Epic Games+UE_4.21.bin’ is denied.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream…ctor(String path, FileMode mode, FileAccess access, FileShare share)
at System.IO.File.Open(String path, FileMode mode, FileAccess access, FileShare share)
at UnrealBuildTool.XmlConfigData.Write(FileReference Location) in D:\Build++UE4\Sync\Engine\Saved\CsTools\Engine\Source\Programs\UnrealBuildTool\System\XmlConfigData.cs:line 127
at UnrealBuildTool.XmlConfig.ReadConfigFiles(FileReference OverrideCacheFile) in D:\Build++UE4\Sync\Engine\Saved\CsTools\Engine\Source\Programs\UnrealBuildTool\System\XmlConfig.cs:line 133
at UnrealBuildTool.UnrealBuildTool.GuardedMain(String[] Arguments) in D:\Build++UE4\Sync\Engine\Saved\CsTools\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.cs:line 512

Update to current post. I have also discovered that I am unable to open any older projects from UE4.20 after the install of UE4.21. These projects shows to be Other rather than 4.20 as they used too. Here is a screenshot of this.

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Since I had not even received any help on this issue, the only thing I was able to do was uninstall EVERY Engine including the launcher and reinstall every one over once again which takes up a lot of valuable time. It would be great if this game engine was not so difficult to use when it comes down to migrating to a new engine. Messes up EVERY project I have every time.