Steering Sqealing noise

Hi

I have a 2000 xterra SE 4x4 with about 96000miles.

When I start it on a cold morning and turn the steering wheel (either direction) I get a high squealing noise. However it goes away rather quickly after that and doesnt happen for the rest of the day until the next morning.

Any clue?

Thanks

have you replaced your belts yet??
checked your power steering fluid??