ACER ASPIRE 7 DUAL BOOT . BOOT MANAGER PROBLEMS AND NOT ENTERING BIOS PROBLEM

SAI10

I have installed kali Linux as a dual boot by following instructions given in the community . It works fine but windows directly boots into windows and it does not show options of chooosing between windows . I was not able to enter Bios and the secure boot was off it i try hitting F2 it strucks . I can enter into secondary os by F12 button and switch between os but if i enter kali and when i close and enter into windows 10 it shows blue screen and DPC WATCHDOG VIOLATION error and it restarts and enters into windows . I was kind of worried Please help me as soon as possible please. How to change my boot manager to Gurb Please help me 

JackE

Make sure Windows fast staart option is unchecked (disabled) in Control Panel's power button app.