Calvoon

Dear all, yesterday i recieved my HTC Vive, I was trying to install the setup, but it always cancels the process with the error "Critical Failure SteamUi.dll" missing. Steam runs smoothly and the "SteamUi.dll file is within the Steam Folder. Steam VR works finde as well. I already tried to delete and replace it, the error occures still. I used the search , but couldn`t find a related topic to my issue, sorry If I overlooked it. Best regards Fabian