I've managed a work around! I uninstalled Silverlight and installed an older version...5.0.6118 and set it to not update, when I press play it prompts you to update but I clicked "run this time" and bingo its working!! just gotta make sure windows doesn't update it for now I guess but its working again, so guess the updated version isn't compatible with something on my laptop
Mine's at version 5.1.40416.0, which was presumably your previous version.
Hope that the graphics GPU rendering now works, as it does help!