The file I downloaded is second from the bottom:
Windows x64 31.59 MB jre-7u21-windows-x64.exe
It successfully installed into the default folder:
When I double click datamodeler64.exe I'm given a window asking me to enter the full pathname for java.exe. I've tried the following:
1. Pasting C:\Program Files\Java\jre7\bin\ into the textbox and selecting OK.
2. Pasting other variations of it like C:\Program Files\Java\jre7\ into the textbox and selecting OK.
3. Selecting Browse and navigating to the Java.exe file and selecting it.
4. Attempting to specify other Java.exe files on my machine in other folders such as C:\Windows\system32 and SysWow64.
All of these attempts returns the message "Cannot find a J2SE SDK installed at path: " followed by each path.