Yes on wood, no on smooth solid concrete
Before installing hardwood floors, you should know the size and costs of this project. YOu can find tips at http://www.hometips.com/diy-how-to/installing-hardwood-floors.html The most important thing to know before installing hardwood floors is the amount of flooring you will need. Make sure you pick out a floor that is durable and will last for a long time. Also, low maintenance floors are great!
yes
you need to include all of the details in making your generalization
Might try to rough up the surface with a power sander & emory cloth but a primer wont do much good, wouldn't waste my time or $$
No, plywood alone is not strong enough for ceramic tile. These floors require a very sturdy subfloor at least 1 1/4" thick before the tile. This requires either using cement board or a pored mudbed.
Pour floor leveler (you can buy it at HD or Lowe's) The floor leveler mixes like thin set, but finds its own level with the help of gravity. It works well on a concrete slab that's not level as well as plywood subfloors.
Defragging the hard drive
restart your computer
Yes on wood, no on smooth solid concrete
Improper installation. You must install cement board over the sub floor before you tile. If the tile was glued to plywood which is not waterproof, the plywood will absorb moisture which will cause the grout to crack and deteriorate
If the carpet glue is dense enough to affect your tile cement then you should remove it by sanding. -If it's only sparse then it won't matter.
No, I would try to avoid that at all costs. If you do it, it will crack. It's best to remove the existing tile and smooth out subfloor before installing any tile, and most especially for installing marble which is very fragile.
poo
Humidity in room under 50%. If it's plywood sub floor moisture level should be below 12 the lower and drier you can get it the better
It is possible but I would not reccomend it. If possible remove the old tile before laying the new tile. If you want to avoid removing the old tile you can lay a cement board over the old tile before installing the new tile.
Marine grade plywood and treated plywood aren't the same thing. Marine grade plywood has special glues and woods that will withstand constant immersion in water. Treated plywood is regular plywood that has been run through a pressure treating cycle. Paint will stick to treated plywood if you make sure to let it dry for a few months before you paint.