Ad-Hoc network

Hey guys, i'm using Windows 7 64-bit operating system. At home i have a Vivid Wireless router which is perfect for all my internet capable devices to connect to. However we are on vacation, i was wondering if it were possible to share my Optus Wireless modem between our devices (PSP, Nintendo DSi and an iPod Touch). I have tried to set it up myself and have successfully done this, connected a device to it (an iPod Touch) yet it says "No Internet Access". How do i fix this?
Thanks in advance.

Not sure of your available options, but assuming that the computer that has the Optus Wireless modem attached has a wireless card also you may want to check into Wireless Hosted Networks, which Win7 supports natively or more easily using a product called Connectify.
Check the article and see if it will work for you, link to connectify at the bottom. http://www.winsupersite.com/win7/totw/whn.asp
Hope this helps.