good ... so your "modem" isn't "in" your PC ... basically you'll disconnect the cable from the modem at your pc, connect it to the wireless router, then out from the wireless router into your PC; voila your done. well, then you hafta setup your wireless network, and then setup your Wii to connect to it, but thats whole nuther hour of fun.
ahhh i dunno then ..... never seen an integral cable modem before; it should have an ethernet port on it anyways i would think, for connecting a router .. maybe check the manual.