Had been away for a while and when computer was turned on and
re-configured (could not access internet) via Earthlink, my router
connection to the other computer was not able to access computer.  I
can use main computer only when cables are direct from DSL modem to
computer not when hooked thru the router.  When I connect the router,
second computer connects to internet and main one does not...How do I
configure the settings so both computers can be used at same
time...always was able to do this but no longer and I think earthlink
had me reconfigure settings so router would not work...have windows XP
and DELL 1184 Wireless Broadmax router.

Uoy can configure another ethernet interface for another pc. But yyour
router must have 2 ethernet interfaces.