How to Reset Hosting Account? Help please

I do not know which section I should place this topic but I think it shall go under here since most of you probably know how to do it.

Anyway, I need used fantastico to install WordPress and I want the script to be remove. I want the hosting server that i am using to be reset to the brand new, original condition.

Anyone know how to do it? Am I suppose to do it through cPanel?

 

I contacted the hosting company but they have yet to reply. i need to get this done quickly