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windows doesn't like being shut down too hard.
there's actually quite many things can go wrong with windows;

if you were running lubuntu from within windows (iirc that's what wubi does) i'm not...

lubuntu - that should be using synaptic.
you just find hardinfo from there and install it. yes, it's a package.

i did not study the dmidecode output but my guess is that your machine has 4 slots...

i just tried dmidecode on my own machine - the output for "memory device" is towards the end - and with | less you have to scroll down to see it.

but i would try to install hardinfo really. seems...