I enter my config password and it asks if I want to enable full text but Firefox gives me a popup that says:

Object reference not set to an instance of an object.

I don't know what to do. Thanks in advance.

is this after uploading YAF on to your wen host?

Yes, I have uploaded the files and modified my config files. I attempt to access /install/default.aspx and when it gets to step 2 (initialize/upgrade database) I get the error.

It may be worth mentioning this is a godaddy hosted site. I know many people hate them, but it is what it is.