My Wifi is Disabled- Problem with my Realtek network card?

Hey people
Here's my problem.
I use the windows 8. Accidentally i disabled my wi-fi connection (like in the picture im doing with the other connection), and since then, i wasnt able to get it able again...

Now, as you see in the same picture, the Wifi connection, as well as the bluetooth, disapeared from that folder

Now i tried to set the wifi connection again, but it doesnt work.
I went to the device manager and i saw that something was wrong with the network card (Realtek....)
I tried to active and deactive, but nothing happened.


The option 'Roll back driver' is disabled (on grey).
I restarted the pc many times and nothing...



Can you please help me? This pc is new... i bought it 2 days ago.

thanks anyway, i've already solved this

What did you do to solve this? If you could share as it may help others in a similar situations.