There's a reason why it's called "Beta".
a) this could be a genuine bug or
b) you are installing on an unsupported system but regardless
c) you need to report such issues to the development team and then still
d) even the smartest software engineer can't help you or track down a bug without some system info
In conclusion: Post in the relevant Beta forum. This doesn't belong here and I don't even need to remind you about the NDA and otehr terms of using this Beta software you consented to when downloading it....
Mylenium