http://i.imgur.com/9GB9NBCh.jpg
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Think someone ran into this back after the first big patch and it was an issue with their version of flash or java or something. Launcher runs in a customized browser, so it's depending on technologies typically installed in them (like java scripting, that error notes a js file). May be worth a shot to update things like Flash, Java, Shockwave, .NET if you haven't done it in a while (not just for the game's sake, but for a lot of recent security fixes they've released).
try updating explorer
Yeah, the script error bug has been around since the Beta and it's caused by your version of Internet Explorer being out of date - the launcher uses IE as it's shell and hence if it's not up to date, it will crash loading certain sections like as shown. Updating your version of IE to at least version 9 should solve this problem.
Otherwise just click 'yes' and then the 'ok' button at the bottom and it should still work.