First off, I'm using Zorin 7 OS. So my Boot folder was too full to install any new updates, I used a tutorial I found somewhere on here to remove the unneeded linux-image files, and must of also deleted the latest one as well. Now when I attempt to boot I get

error: no such partition.
grub rescue>

I used my MultiSystem USB to install (on a separate partition) a different Linux OS (Kali)
and no longer get that error, however, it will ONLY give me the option to boot Kali Linux.
Here's the biggest new problem though, I used the built in option of hard drive encryption for Zorin 7 when I initially installed it, so now when I attempt to explore it (to get all my saved data which is REALLY important to me), it asks me for password for encryption. However, the password says it in not recognized, and I know it's right, I had to type it in every single day.

So I either need a way to restore my Zorin 7 boot files or GRUB or whatever, so I can boot it up... or I need to know how to fix my encryption problem to save all my info.