Adding google adsense to payment modules

[DrByte]

If I uninstall the whole darn zen cart and reinstall is that going to delete all my products?

Yes.

...and what is sandbox because my paypal configuration isnt working now.

A "sandbox" is a "play area" where one can perform test transactions without incurring transaction fees because you're not really playing with real money. For the most part, sandbox testing shouldn't be needed unless your webserver has configuration problems and cannot talk to PayPal properly.

Your more important task is to get rid of the extra files you uploaded.