I am sorry you are having problems but let me help you.
Please note that this behavior is normal and expected. When installing the driver on this chipset will list two of them but it is normal and there is nothing to worry about.
Is that because there are 2 cores?
In this case it is not related to the cores of the processor and the chipset is a different part. It may be a glitch on the software but should not affect at all on performance.