Prevent Duplicate Entries when Editing Data using Userform

Good Day

I have using this user form to add, edit, delete data. The userform thus far works brilliantly thanks to this forum and its members who assisted me.

I have this issue whereby when I am editing data, I want the system to check that the edited data is duplicated or not. The fields I am particularly concerned about are: ALB Tag# and the Power on Password and Computer Name

I have attached my spreadsheet for better clarity

Thanks