Problem with creating menu button -"Product page"

I was trying to create first product using article in your FAQ ("Your first test sale") for mroe then 2 hours but i still get the same mistake: 404 when i`m trying to open product page.
What have i done:
1. Added a product in Hikashop.
2. Created button im my main menu for product.
3. Bound product to this button.

The worst thing - it`s not a hard job, everything seems so easy, but whatever i tryed to do (cleaned cache and etc..) i always got 404 page, when tryed to enter in product page.

PS. Product shows well in HikaShop Content Module, i even can add him to shopping cart.
Screenshots:
1. - menu button.
2. - chosen type for this menu
3. - product page
What did i miss?
Thx for help.

Oh, didn`t see your message.
Yes, SEF system was a problem so i`ve fixed it with sh404SEF.
Anyway, thx for reply.