The vast majority of those error codes don't actually come from Inquisit directly, but rather the respective machines' OS and display systems. Inquisit merely propagates those standard error codes. E.g.
Unable to save temporary file 'C:/Users/[REDACTED]/AppData/Local/Temp/positive2.jpg'. The process cannot access the file because it is being used by another process. (Error code: 5)
is a standard Windows error code meaning "Access Denied". You can find a comprehensive lists online:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms681382%28v=vs.85%29.aspx
Similarly, errors such as
Direct2D Error: 0x88982f80 The pixel format is not supported. Line 259, File win\Direct2DGraphics.cpp
come from the machines' Direct2D environment. They may point to issues with said system