I installed the game after buying it last week on my desktop, all good.  Tried to install it on my laptop today and it keeps not finding certain meshes, so i have to skip them.  Once the game is rather shakily installed, it refuses to work and i find myself doing it all over again.  Am i going to have to go back to the shop?  I'm not even sure where the receipt is now, and as i've opened it they probably won't accept it as a return......