its an old motherboard but i have upgraded it and everything.how do i put it in a new case even thought the slots are wrong

get a newcasexcase.co.uk

It depends on the case that you have. If you have removed a motherboard from the case it may be that you just need to remove the brass fitting that you screw the motherboard to.Lay the motherboard on the base plate and check the fittings mark them and then replace the brass fittings into the new positions and screw your motherboard to them If the motherboard still wont fit you will need to get a new case