[Plugin: WP E-commerce] Main product page category image size

Here is my problem.
I have started an E-commerce site using the WP E-Commerce plugin. I have created categories, products, the whole she-bang and to this point I believe done well in editing the CSS/PHP coding, since I’m not really a web-coder.
The only issue I am having is that on my main Shop page here:
http://frenzified.com/?page_id=3

As it currently is, the category images are coming in at 32×32.
I would like them to be bigger, say 100×100 so I can use the images as the main links. (I have added text just so people know what the heck it is). When you click on the individual categories, it brings you to that category page, and those sizes are fine. It is ONLY the main shop page that is having issues.
I am wondering if:
A) if there a place to change this, since if you see the source code for the page, you can find where it is saying 32×32 size, but I have NO CLUE where to find it (and I’ve been searching) in the CSS or PHP pages.
B) if it has to do with what version WP I have: 2.8.6 (I’m so paranoid I’m gonna lose the entire site if I upgrade- already lost everything when I tried to move it all to a new url.)
C) if this is WP E-commerce trying to make it so I buy Grid View from them. (aka. if the only way to get this fixed is to purchase grid view gold cart).

I have tried changing the size in the Products>Settings>Presentation> Thumbnail settings. Also tried changing them in Products>Categories and altering their individual size of the group image and the thumbnail size at the bottom of each Category, where is says:”Presentation Settings
To over-ride the presentation settings for this group you can enter in your prefered settings here”
And none of these have changed it at all (only changes things on the individual category pages) not the main Shop page.

So if some can let me know if this can be fixed with coding, etc. or if it only can be fixed with buying Grid View, it would be very helpful to me. Thanks!