If you want to setup linksys WRT54G2 wireless router with Comcast then follow my blog -How to Setup Linksys WRT54G2 Wireless Router with Comcast , which i have discussed in same blog.
Step1: Connect your computer to the router via Ethernet cable. Then turn on your computer and open your web browser put 192.168.2.1 in the address bar of your browser .It will access the router control panel.
Step2: Type admin for the password of the router, click ok and then click on setup then basic setup.
Step3: Select a static IP or a dynamic IP, depending on your particular network configuration.
Step4: Click on the save setting then go to the wireless section and then click on wireless settings.
Step5: Select the wireless mode which you want, along with what SSID you want for your wireless network.
Step6: Click on the save setting and to choose security mode and setup a password, go to the wireless security section. Your set up password will be useful when you logon to the wireless network on the router.
Step7: Click on the save setting to connect the router to your internet modem and then restart the router to complete the setup and setup an internet connection to the router.
If you want reset the linksys router password then follow this article-How to Reset Password in Linksys Wireless Router.
Note:To solve any problem on linksys router ,you can reach online technical support service desk of V tech-squad at their Toll Free No +1-877-452-9201 .