Magento

I can not get Magento to add products to my catalog. when i put in all the information for the product, it just sits there with the “loading screen” up. I had to run the other day so i set it up to load and left for about 3 hours, came back it was still going. i hit refresh, and it went right back to the add product page, but it was blank, and the product was never added. I even re-installed Magento. still not worky. any ideas?

ttt