Limited Account Is Unable To Access Internet Via Wireless Connection

WinXP SP3; A limited account is unable to access the internet via wireless connection unless an administrator account has logged on to the wireless network. Works Ok after administrator account has logged on and established link.Our church wants to set up a computer in our library for visitors to use to access the internet. A hard wire connection to the router works with the Visitor Limited Account without the Administrator account being logged on. Running a hard wire CAT5 cable to the library isn�t an option. The computer�s wireless adapter is Belkin G Plus MIMO USB adapter. The DSL Modem/Router is a Siemens SE 567.