On the homepage, the tabs at the top (computers, notebooks, cameras, car comp(?), cd/dvd, mp3 players) and the other navigational links (shopping cart, my account, home, about us, contact us, help) are not clickable.
Additionally, "notebooks" and "car comp" are both highlighted in green. I would assume this would mean both tabs are selected, but I'm not sure how/why this would be as it's on your top page.
The "About Us" and "Contact Us" in your right column are linked as secured pages. Was this intentional?
The header graphic is missing from your category and item pages. It appears the file is looking for something on your local hard drive, not from your

image directory.
At the bottom of each page, the "Questions, Click Here" and "Help Center" link boxes don't link to anything. "Guarenteed Secure Shopping" needs to be spell checked.
On the "About Us" page, "inovative" and "techniquse" need to be spell checked.
On the "Help Center" page with common questions, the answers don't appear until I mouseover the question. Was this intentional? Also, the refund policy answer is pretty long with all of the double spacing. "Encription" in the site security answer needs to be spell checked. Different answers use different size text - Site Security and Refunds are not the same height.
During checkout, on the payment screen, the first option is "Visa - Thank You" but then the drop down has both Visa and Mastercard. The second payment option is only a dash. The PayPal payment option has a field for email address. If you were not upgraded to 4.1.1 to have this removed, might want to open a ticket to get the upgrade. The PayPal option no longer has the user enter their email address at this point.