These nasty spikes sticking up an an angle toward the walls, all around the walls are carpet tack strips. These yard stick size sticks are to keep the carpet in position after streatching. But, they are a pain when you step on one or cut your finger on them.
First, they are nailed down about every 6 inches with a nail for wood and concrete. The nail is about 1/4 inch long.
I would get a good nail puller or a wood chisel and a scrap of 1/4 inch ply wood. The nail puller is to grab and leverage the nail out, the ply wood is to act as a protectant to ensure that the claw does not harm or damage the floor.
This will be a timely process and some will come out very easily and others will take a pry bar. What ever you use to remove this, make sure you are not damaging your floor.