I can't help you with the codes and Windows in general, but I would like to direct your attention to the download page of SL 16.4.2. This is the direct link: http://www.presonus.com/support/downloads/StudioLive-16.4.2.
The latest version of Universal Control for legacy boards is 1.7.4, but it may well be that 1.7.2 works better on your system. It is very important to use matching versions of firmware and software. Also Windows 7 needs to have Service Pack 1 installed. Please read the paragraph under "Legacy Downloads" and the "release notes" for the UC you want to download.
For the FireWire card please check this thread in the Knowledge Base: http://support.presonus.com/hc/en-us/articles/210047053-Is-there-a-Firewire-Compatibility-List-for-Firewire-cards-. The chipset of the card must be compatible and make sure that your are using a 400 to 400 cable. If you need more help, please ask your question in the forums ("StudioLive Classic").
