In reply to allanscott:
Which browser are you using? On windows 8.1 and earlier the default is Internet Explorer, while on 10 it is a new one called Edge. Edge has come in for some criticism, as it's a little buggy and perhaps not quite finished. So you might have better luck using Internet Explorer (which is included on Windows 10, but isn't the default) or by downloading an alternative such as Google Chrome or Mozilla Firefox.
Edit: gethin_allen's suggestion to check your browser's addons is a good one, unless you are using Edge. In Edge, flash is built-in, not an addon (in fact I don't think addons are supported by Edge at all yet).
Post edited at 00:16