see what you need to do is go down to the beach and get yourself some sand
half fill a bucket with some sand and bury the 1 GB memory stick inside it
remove the 512 mb stick from the computer and press it into a block of wax to form a shape mold
into this mold, pour some more sand in there and then heat it in the oven until the sand melts and joins together
remove it from the oven and you will have some sand in the shape of a 512 memory stick
put this sand made memory stick into the computer where the 512 stick originally was
next, remove the 1GB stick from the sand bucket, then take the sand bucket and leave it outside your neighbours door with a note saying 'i don't want this anymore'
put the 1 GB stick back into the computer and apply some paint thinner to it using a small paint brush
your computer should now work properly
hope this helps