Caveat: I'm still guessing ;-)
This is sounding like the old Font problem, actually. In a nutshell, you may have a corrupt font file in your system's font directory which is causing Windows to crash out the JVM.
Unfortunately, it's very difficult to troupleshoot with the installer.
The easiest way to proceed would be to install HD onto a different machine and then transfer the installation onto the problem machine.
When you launch HD after the transfer, it will likely crash (for the same reason as the installer). However, HD keeps a log file each time it runs, and includes all font accesses in the file. If/when HD crashes during startup, you can open the file "trace.log" and look at the last line of it. It should be a font definition. The next fone (alphabetically) in your system's font directory is corrupt. Remove that file and retry HD. Repeat until you've removed all corrupted font files and then you should be good to go.
White Hats are for CISSPs
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