Since this was a fresh installation, I will also say go for a reinstallation.
But this time, check few things
- Verify the ISO checksum
- Select gpt and UEFI in Rufus while creating the Zorin bootable USB.
Note that Fastboot in BIOS and Fast Startup in Windows are 2 different things. Make sure Fast Startup is disabled in Windows, it's very important.
Before that you may 1st completely remove Zorin from the system. Here is how: Is zorin os support legacy booting? - #11 by Ponce-De-Leon
It's best as a novice to choose the Install Alongside Windows option during the installation.
If you still need a manual partitioning then I highly recommend this video tutorial:
