One of the pitfalls of trying beta versions (or release candidates) is that they're intended, as it says on the sight you link to, for IT professionals and not the casual user who happens across the sight.
It is almost expected of these programs that they may go wrong - that is the point of issuing them to "people in the know" before releasing them to the genaral public.
There is a contact on the link for reporting anything untoward. Give it a try.
I gave it a whirl last week just out of interest, one thing I did find was that it would not uninstall which wasn't a problem to me. But unless you have images of your drive or are installing it on a spare Pc I would hang on until the final is released.
I had a look last week. A bit of a disappointment for such a big download but I assume that there are lots of bits underneath that are not apparant. Got rid of it after a day, as I don't like having Windows Update with an automatic setting, and the nag screen got on my nerves.
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