Hello people. I need your help. I am working hard on my magento store...I am newbie. I have uploaded new magento theme and to my surprize it looks different on one computer than on other. See picture:




On computer A the main section of my store is wider.
On computer B the main section of my store is narrower.

On both computers I am watching the same websete/store...on both computers I have IE and Fireforx and no matter which browser I use on THIS computer results are the same for two kind of browsers.

What can be a reason for that? Maybe one of computers is missing something? As far as I know the website/store should look like on first picture(wider). Thanks for any help...