Error - Please help with Category, search and manufacture

[77predator]

Hi There,

I installed the cart yesterday and everything seems to be fine until I started to add Categories and Manufactures. The pages do not show up on my site after I create them and I get the error 404 not found.

Does anybody know what the issue is.

I.E:
A) I created a manufacture Nikon but when I click on the link from the home page or anywhere else I get the error http://www.digitaldiscountproducts.com/3_nikon
I created a category called "Camera Accessories" with the Friendly URL: camera-accessories but when I click the link from the home page I get the error http://www.digitaldiscountproducts.com/7-camera-accessories
c) the search function also seems to be broken. I created a product under the Nikon category and when I do the search it comes up but when I click on the link I get the error 404 message for link http://www.digitaldiscountproducts.com/digital-camera/10-nikon-coolpix-s220-black.html

Thanks for any help.

Regards
Rod