If you have not bought the laptop already, suggest avoid Dell.
I am using Dell Core 15 with windows 7. Face the following problems which are a real problem for trading.
1. Dell drops internet connection often. Two of my friends have similar experience with Dell.
2. The function keys are an issue, really idiotically assigned. E.g F2 will switch on or off the wireless, F4 & F5 are used for adjusting brightness. F7, F8 & F9 are used to mute, and adjust volume. and F10, F11, F12 for rewinding and FF video. Basically if you want to use function keys, F1 or F2 to buy or sell, you will have to press the function keys!!
3. The laptop heats off too quick.
4. Lastly, my battery has gone off in just over a year. I am getting repeated messages to change the battery and need to be continiously connected to the power.
In my view, Acer is a better laptop in terms of function and value for money.