My action! wont launch. I ave full version and when i open action it says something windows found problem or something like that and i have to close action always after that message. I cant do anything. I reinstalled action and tried over 10 times

My action! Wont upload videos to youtube anymore. Yesterday it was uploading normally but now it exports video and then it says that upload failed and in that uploading screen it says exporting completed. I have windows 8 on my pc. Thanks already if you helped!