As Aslain indicated the error you are getting is not related to the modpack or wot. It is related to windows itself. Checking Microsoft, they are saying it is either corruption with the user account or a system file is corrupt.
Below is a link from Microsoft. Even thought they are talking about Windows 7, it would apply to other versions of Windows
https://answers.microsoft.com/en-us/windows/forum/windows_7-networking/shellexecuteex-failed/dca547f1-070d-4793-8a75-8a22d63daaae