I just bought a older house and I pulled up the floors to find some pretty nice hard wood. The problem is that it is very noisy. The floor creeks. what is the best way to take care of this problem?

Are the joist under the floor exposed ?

No. The basement is finished.

Squeeks are caused by some deflection in the floor, when the boards move they are rubbing together. To stop the sqeeks you ahve to stop the movement. Often this can be done from underneth the floor but in your case its going to be a bit tougher. Are they in "spots" or in general does the whole thing squeek?

if the wood was installed over a concrete pad they probably used some form of sleepers which would limit you to nailing depending on the spacing

The sound comes from most of the floor. like it may be the sub-floor that moves. It makes it very noisy down stairs. Do I screw each board? Also so I am not misunderstood, the wood floor is on the main level. The basement below is finished.

Does any one have a suguestion? or solution.

Could be it is installed over particle board, with a stick nailer and a substrate, that wasn't near flat enough.

Just my guess.

LOL

You can try Face nailing it , and applying a matching putty .. Are you going to cover this floor with another ? if so , then you can go a different rout .. if not the screws are not the answer ..

I am trying to just refinish it. I was told nails would not work and just live with the noise.

On some older homes, they often used 1x6 solid board sufloors and just nailed them down. Over the years, the boards shrank and the nails could work loose and ride up and down, causing creaks, squeeks and moans from the flooring. The only remedy for this particulat problem (if it is wide spread) is to remove the flooring and re-attach the subfloors. It can be done from below the subfloors using shims, glue and glue-blocks. One idea would be to use a deck fastening system that consists of a L-shaped steel channel. One would install that with screws into the joists up against the subfloor then using short screws, screw the subflooring down to the channel.
http://www.deckmaster.com/what.html
http://www.rockler.com/ecom7/product_de ... okietest=1

Would not countersink predrilling and screwing and plugging not work here.

Yes, but it would be ugly with all those plugs in the floor! And it would be difficult to align with the joists, which is what would need to be done to tighten up the subfloor. Just my opinion. I never cared for the look of a floor with plugs.

Is it a tongue & grove floor ? Or is it the old faced nailed with butt joints ..
If its T & G , we used to inject the heads of bowling alleys by drilling a 1/8 hole on a angle into the tongue , and injecting a 2 part epoxy into the board .. they were like concrete when we were done .. you might ask the owner of your local alley who does their lanes and give them a call .. you wont be able to rent this machine , and it cost to much to buy ..