RE: Cursor is invisible during and after installing windows in Dell Inspiration 15.
I would suggest you to update the BIOS on the system. Please enter your service tag # on the link below, select the OS, then download the BIOS from BIOS section onto the system and install it.
Also, we need to check if the issue is caused due to any application installed on the system. So please clean boot the system using the link below and then reinstall the touchpad drivers on the system.
Please let me know if this helps.