I just installed the latest version of the Windows 10 Technical preview and it lets me boot in to the sign in page, but as soon as I click next or press enter after typing in my password, the page goes nowhere and eventually does the usual windows "not responding" fade to white followed by an immediate reboot of the computer. Is there any way to work around this? If not, how would I go about reverting to windows 7 if I am unable to access the OS itself?