ok, i bought a new router.(wife insisted

) however,since connecting to it, my download speed has reduced 3mb's. if i connect direct to my modem it's maxed out @ 12.87mb's. is there a setting in the router i need to change to fix this? also, i cant get the wife's laptop to connect using wireless. and when black is down, he cant connect either? even tho they have the password correct.
http://www.newegg.com/Product/Product.aspx?Item=N82E16833127243