dxdiag would tell you what your graphics is as well as the rest of the system specs, you can get to that from the pressing the windows key then in the text box there just type
dxdiag and tap enter
P.S. you may be able to update to windows 10 for free by the way
http://www.microsoft.com/en-gb/windo...%2010%20update
As for the Q try the software plugin P.E.Op.S Soft driver instead of Direct 3D or OpenGL you have a very low end system that will struggle with the more advanced plugins
But for OpenGl or Direct 3D try using the Fast Option that will give you the lower end specs for those plugins
It sounds like it's a speed issue rather than an actual sound plugin issue
P.S.S. the reason you found it hard to find an un-dub of the game is because it was never released in english to start with so was never dubbed in english (never had english voices) to be un-dubbed to Japanese but the games text was translated to english some time ago now