Gator957,
Setup should look like...
Wall > ISP Modem/Router > Wireless router(if any) > Wired/wireless
If using DSL, a DSL Filter MUST be on ALL devices, phone, answering machine, faxes, etc..., everything EXCEPT the DSL Modem/Router.
You may share a DSL Filter.
Wall > DSL Filter > Splitter > Multiple Devices
You'll need to setup the wireless router like you did when new.
How to login to your wireless router use these Recommended Wireless Router Settings I use channel 11. I would make a new SSID to make connecting easier.
Remember to power cycle the modem and the router.
Power off your ISP modem/router and your wireless router(if any) for 30 seconds. Then power on the ISP modem/router. Wait 15 seconds, then power on the wireless router(if any)
Rick