Well, for some reason everything is working fine again. All of the settings appear to be set to their defaults so I'm still clueless as to what happened. All running nice and smooth again, even images dragging perfectly (no legacy drag). My PC was on all night and I don't see any updates but I'm happy it's all back to normal. Just bugs me that if it happens again I'll be none the wiser! Thanks for your replies folks.
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