My dsi wont connect to the internet?

i have a home connection that works with all the computers and laptops in my house but when i try to connect my dsi to the network it wont work. my network is called valetplus its with cisco. i also tried to connect to a reasturant across the street ut no luck there either plz somewon help me thanks! p.s. i rreally need to know by tommorow cuz im going 2 michigan for 4 days for a funeral thanks!