I had a Windows system then I deleted and installed zorin os 16.3 the i install kali linux and the boot loader for kali and i wont install zorin's boot loader
Welcome! 
I would start with the Boot Repair utility from almost any USB installer Live disk. There are a few options, just run the recommended repair and that should find any installs and add them to the freshly installed new Grub - reboot, and should see Zorin and Kali after that.
Are the two installs on the same disk or separate HD's?
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