linksys wrt54g problem

I have an XP desktop, at&t yahoo dsl service, and aol for "bring your
own service". I set up a linksys wireless router so I could also
access the internet with my dell laptop runnning XP media center
addition. The dsl cable goes into my modem and then I have cables
running from modem to router to desktop. Everything worked fine until
I attempted to add a wireless HP Deskjet 6980 into the mix. The
instructions said to push the Secure Easy Setup button on the router
and then push the wireless button on the printer. This didn't work so
I next tried connecting the router and the printer directly with an
ethernet cable. The printer was then recognized by cable, but it
still could be found wirelessly.

It was at this point that I realized I had lost my ability to connect
to the internet on both my desktop and laptop. A friend suggested
going into "network connections", right clicking on the local area
connection and clicking repair. This worked briefly and quit. When I
try to repair again, it says it can't. When I tried this same thing
on my laptop, I got a windows error about conflicting IP addresses,
and the wireless connection appears to continuously disconnect and
reconnect. The power light on the router flashes continuously.

I've resigned myself to connecting the dsl directly to my desktop. At
least I can get the connection to work this way, but I can't use my
laptop wirelessly then.

Any suggestions?

Thanks,
Chris