uhm if i do this i play 3 times or more...
restart back normal kd and other stuff :s
make a tutorail xD or w.e
what you do is this:
im am now currently lvl 70 prestide 10 (im not)
i delete all my stuff from blah blah folder..
i then run the game and itll show im lvl 1 no prestidge,
then play any game you can win games and MAKE sure you level up or else steam wont sync your files to the "cloud" or w/e,
once you have past lvl 1 and are on lvl 2 you may now freely close your mw2 knowing that when you come back and open it again you will see lvl 2 prestige 0.
is that a good enough tut?