You should not be playing with partitions. Besides, partitions do not cure slow PCs.
https://www.google.com/search?q=Acer+ES+15&ie=utf-8&oe=utf-8# did not find your model so I can't comment yet.
Please supply the full model number or a link to yours.
Just purchased this computer. Out of the box it is slow. But i did download Firefox before i did much with it. But even not connected to the internet. Every thing is slower than i'm used to. Any suggestions? I'm not a pro at all.All I know is the web and office. I don't know about partitions etc. Any insight whould help. Thanks