Download manjaro again
Download and install [ventoy] on your Windows system - prepare the USB using ventoy - drag and drop the manjaro ISO onto the usb.
That depends on what is causing your issue - there is no 
you can use.
But since you are experiensing black screen one thing to ensure is that your gpu and kms is configured correct.
How that is configured is depending on your GPU or combination if it is a laptop with iGPU and dGPU.
There is a huge amount of topics on black screen - take apick