Have you switched off fast boot and secure boot in the BIOS?
If you are using dual boot with Windows: Have you switched off fast start in Windows?
When creating the USB boot stick, did you make sure to select the correct file format for your PC? If you have an older legacy BIOS (which I suspect if XP was installed on it), you should select MBR, and if you have UEFI, GPT.
It is recommended to install Zorin lite on old hardware.
Is AHCI enabled if you use a SSD and RAID if you use a hard disk?
Do you have a 32 BIT System architecture or 64 BIT of your processor? Zorin 17 is only available for 64 BIT.
Or it may be that the .iso file is damaged when it looks like here:
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