You're right. There's a lack of input from Adobe on this forum. There's also a shortage of input/help from the community as a whole. (Except for a few individuals, people tend to show up, ask their question, and then leave, or else someone starts a rant against Adobe and then everybody else piles on; the latter tend to be the lengthiest threads with the most views.)
That said, this is a user forum, intended primarily for people with specific questions about the software—how to use a feature, how to accomplish a specific task, etc. Your issue is a bit more in the domain of technical support. (As a Mac user who's not experienced this problem, I have little idea how to help here; reinstalling Fireworks was a good idea on your part, and it's a bit surprising that it didn't work.)
There are other Adobe forums available:
http://forums.adobe.com/index.jspa
If someone on the "Downloading, Installing, Setting Up" forum kicks your question back to this forum, just post again and make it clear that it's an installation issue, not a Fireworks application/user issue. Otherwise, contacting Adobe's customer support/technical support would be recommended. As always, Google is your friend here; try searching terms like "Fireworks CS6 installation internal error occurred Windows" and variations like that, to see if you can find a posted solution to this problem somewhere.
Also look for pages like this one: http://helpx.adobe.com/fireworks/kb/fireworks-cs6-known-issues.html
