How can I fix my Icatch VI PC Camera?

My Icatch VI Pc Camera from Ezonics will not focus and all i am is a big blur. It is plug and play type. It still is taking video but i can't focus or something. You adjust it manually and I keep turning the lens thing but it just wont work. How can i fix my focus? Do i need to install it again or is something broken inside? It's new and i used it once and it worked fine but then the next morning it was fuzzy and i am just a blur.