I'm betting your laptop is the Lenovo Y580 with Core i7-3610QM and Nvidia GTX 660M. If you are getting blue screens on winsat mem, try to test your RAM with Memtest86+. This gives you an idea if your RAM is perfectly seated and working optimally. RAM - Test with Memtest86+
If you get errors, try to open the laptop and reseat the RAM modules. If you still get errors, then get a replacement if it's still under warranty, but never tell Lenovo that you opened your laptop.