trying to import sample files and got stocked for 5hrs

Hi i did try to import “the main” sample files again because i was missing the revolution sliders samples files and the layer slider plugin (This option warn me about the fact that im going to lose all the setting and configurations already made).
what happens is that is been more than 5hr stocked in the process, so i try leaving the page and now i can´t load any page on my dashboard, if you can help me please.