Are there any unworkable disc drive on your computer? 

If yes, Nero BurningROM may have loading issue when it starts. You can disable all your disc drives to check.

How to disable disc drive:

1. press the windows key + R key, a dialog box of the running window will pop up.

2. Run command "devmgmt.msc "

3. In Device Manger, find your disc burner and disable it.