I did some more research on your error messages and I found that:
1:1101 2:C:\Config.Msi\33e0c89e.rbs 3:32 actually means: "Could not open file stream: C:\Config.Msi\33e0c89e.rbs. System error: The process cannot access the file because it is being used by another process."
1: 1712 means: "One or more of the files required to restore your computer to its previous state could not be found. Restoration will not be possible."
I don't know what that means out of context, but maybe can give you a clue what you are doing. Maybe you were running the installer twice?
The error message 1946 should have an additional text, something like "HRESULT ...". Can you include the full text?
And finally, you can try running the installer with logging enabled, using the command lines listed here:
http://www.classicshell.net/faq/#install_commandsAttach the log file here.