2000 Elantra electrical problem

Coming to a stop last night, attempted to roll down my window, it was very slow. Headlights started to dim, air bag light came on, window wouldn't roll back up, engine started running real rough.

I coasted it to the driveway, shut it off, then started it again in 15 minutes and it ran fine. Car has 238k, original battery and altenator.

Any thoughts? Is the altenator easy enough for a rookie to change? Private emails to waleygator@yahoo.com are welcome...Art

Car has 238K with the original battery and alternator?????

This car owes you nothing. Replace the battery for starters. Take it to Walmart for a cheap quality battery and a free install.