My house was built in 1987. Many of the nails used to attach the drywall are starting to protrude from the surface of the wall. this can be seen in many rooms/places, although some are worse than others. i need to get the interior painted, but am not sure what to do about these nails. can i just pound them back in and cover with filler? should screws be put in instead or addition to nails? in some places the tape used at the drywall seems is also affected by the nail protrusion. should this be replaced also? Overall the drywall is in good condition otherwise, with no moisture or other detectable damage.