1) A few games I've installed (most recently I believe was Mata Hari) come up saying "your version of DLA can read files on this disc but you will not be able to edit or add to them". What does that mean to me as far as playing the game? They seem to play.
I found an answer to that question
***here***. He shows how to disable DLA, but I don't think this is an error that's going to keep you from playing the game. It's a warning you can't do something you wouldn't be doing anyway.
2) While trying to install Memento Mori I received a BSOD stop error: Page Fault in Non Paged area. What does that mean?
I found a bit about that error
***here***He says
After doing some research, I found out that this error message basically means that Windows is trying to find a piece of data in memory and it cannot be found.
According to Microsoft, this error can be caused by faulty hardware, anti-virus software, a corrupted NTFS volume or a bad system service.
Maybe that gives you some idea where the problem might be -- for example if you had an antivirus running when you installed the game you could try turning it off.