Kevin205,
1- To revert back, can I just re-install the database files, or do I have to re-install the entire site?
The database is not truly "files"
Just use phpmyadmin and select the database and drop all tables
Then import your database backup sql
2- Also I am not getting "Easy Populate" under "Configuration", It is under the "Tools". How can get that to show?
If you are not seeing ep under config and tools - you have not installed it correctly

BTW: How did you upload the csv if not through the admin??