add prefix to database

[balihr]

Can I add a database prefix to an already installed and configured shop? What is the easiest and fastest way to do it?

I have 195 tables so renaming it manually is a suicide... I've tried running zc_install again and choose database upgrade, but when i click "upgrade db now" i get a white screen and all it says is

in:
[SHOW TABLES]

and no change is done to the database.

Also, I can't use addon "database table prefix changer" since it only changes the prefix and i don't have a prefix.

Is there a way to do it from phpmyadmin?

And, yes, I know of all the problems i could (and probably will) have, but i really need to do this.

Edit:
Forgot... ZenCart 1.3.8a, PHP 5.2.6, MySQL 5.0.67-community, still on localhost using xampp