arsmusic on "Wordpress with MarketPress Lite Cart problems"

So, I have a website:

http://generalproductionservices.com

This is a website I am building to replace an old website we have lensclens.com. I will migrate the site over when I am done. I am having some problems with the sidebar showing up when I am in the cart. I am new to wordpress (I have used it a few times in the past year but I am not expert).

I am using MarketPress Lite for the products/cart. When I have wordpress and create a new page it shows the sidebar on the left. I can click and switch for "full width page" and it is gone.

[IMG]http://i64.tinypic.com/b5it0o.jpg[/IMG]

This is when I can access the page like here:

[IMG]http://i67.tinypic.com/34t8qh2.jpg[/IMG]

Now for the cart when I start checkout MarketPress creates the pages for me and I have no access to them.

[IMG]http://i63.tinypic.com/2mxqqyw.jpg[/IMG]
[IMG]http://i67.tinypic.com/35chkjb.jpg[/IMG]
[IMG]http://i64.tinypic.com/17flp3.jpg[/IMG]

Then on the next page it takes me to Paypal and the sidebar is gone. So how do I get ride of it on the three pages I posted above?