Dell 7559 Two questions

Good afternoon!

I bought the new gaming laptop Dell Inspiron 7559 with the service tag JJXL1D2. This laptop didn't have windows, only ubuntu. Yesterday I checked BIOS, I left my choice on Legacy between Legacy and UEFI and windows 10 Pro was installed by myself from usb. After installation of OS I downloaded all drivers, included for BIOS and that's all were installed. 

After all this full inspection was carried out (40 minutes) http://www.dell.com/support/home/ua/ru/uadhs1/product-support/servicetag/JJXL1D2/diagnose and noone problem didn't find. What's a problem? After reboot of my laptop and shut down and start my mouse Razer Naga is not working. I disconnected it and connect again and it working. After each reboot my USB are not working. BIOS returned to default settings, USB wake support and USB debug are enabled. What's a problem? Is it problem with new driver for BIOS?

This page also was useless http://www.dell.com/Support/Article/ua/ru/uadhs1/SLN115082

And also the second question: I installed Dell Power manager lite. Is it help for battery to save in good condition my batteru automatically or I must to do something? I like to play games and my laptop will be connected to the electrical power everytime.