When try running jdk-8-ea-bin-b120-windows-x64-12_dec_2013.exe on Windows 7 64-bit, it gets up to the dialog box for choosing the JRE installation path. I hit "Next" and it hangs with this dialog box.

It hangs this way forever. This occurs 100% of the time I run the installer. If kill MSI*.tmp in Task Manager then the JRE installer begins running and the installation completely successfully. Sometimes the installer (and uninstaller) hang at "Please wait while Windows configures Java 8 (64 bit).