startup problems

hallo

my sons computer has sins a few days a problem that i can,t fix

when turning it on the computer says that there,s a problem with a parameter that,s changed

and when i go on by pressing F1 you only see the light bar from windows starting up and then after a few moments there,s a blue screen gomming up with a message that i have a unmoutable boot volume

can anyone help me wiht this problem

thanks