I have a Private Pilot - Single Engine - Land, but I haven't flown in a couple of years.

My Medical is still good until the end of April 2007, but I didn't take my biannual review, so I guess my priviledges expired as of the end of October 2006.

How do I renew my priviledges? Do I simply schedule a biannual and it's all good again, or now I get to take the Written and the PPL Checkride again?