INF drivers from the chipset are important. I just realized windows by default gives you some really old generic drivers that wont work with your mother board, yes makes the computer able to work, but doesnt do it right.
Always had thought that the windows update searched for the best drivers your mother board can use............WRONG.
Sucks to know that been using my computer with the wrong drivers for almost two years, alwyas felt the pressure of the tablet super wrong. I barely touched the tip tot he screen and was already giving me 30% of the pressure. I noticed this by helping other deviant art user who had a similar problem.
Realized all my usb drivers were from 2006, that doesnt even made sense because mother board was 2 years old. So i look on my mother board web page, searched for the chipset drivers(there are two) install and reset.
Now its ridiculous how my tablet behaves, i put my settings on the minimals, and i mean super smooth, with the lowest hardest pressure and i can control it so easily. I cant believe i made a childish mistake of not putting the drivers. I thought windows did this for you not even with the service pack 1.
Never ever ever trust the service pack. Search for the drivers by your self, windows wont install the chipset drivers, only audio and sometimes monitor.
Two important things to make my tablet work that i noticed on past week, wacom dont work properly on windows 8.1 and they required INF chipset drivers. Two things wacom forums never explanined to me, its a shame if i knew this 2 years ago mya paintings willl be done easier.
No wonder why i thought i was drawing slower, because took tons of strokes to compensate a bad pressure.
On the good side, now my tablet works fine. Finally took me 2 years since day one.