Is the Launcher started as Administrator?
As the message says, something is blocking access to the options file. The access is needed for widescreen options etc.. You either did not start the Launcher as Admin, which it normally should be as standard, or your Antivirus is blocking access to the file. Which Anti Virus are you using? Do you have access to the folder and file via Windows Explorer?
Edit: By the way, please do not make double posts. We have an edit option here in our forum, please use it instead of making two posts in a row.