The message about digital signature is fairly common and can generally be ignored. As I understand it it just means the software developers haven't sent their product in to Microsoft to have it registered.
The other problems you are having sound like driver issues, you probably need to update them from the software vendors website.
I've recently gone through the same exercise myself, annoying how some software works without a hitch but other stuff you have to go searching all over. Couldn't get sound to work on mine, two days and a few one hour phone calls before I found it had been turned off deep in the bios.
