How to downgrade to level 1?

i have used a hack called 1.0.177 Statistics Trainer - MPGH Hack Team
then i press 0 many time it upgrade my level
but while i'm in-game.
i killed a enemy,it show me a error message and disconnect me from server
[ERROR: Security Problem on Host - Disconnecting for Safety]
just like the screenshot below

and i tried to downgrade using Statistics Trainer
then i back to server,everything fine,the error message won't show again.
but every time i re-start MW2
it still 70 level.what can i do?
things happen again.

make another steam account , and reinstal the game

Or just prestige that fixes it btw its not from our hack it also could be that you played in a hack 3rd person cagematch with like 8 players

delete the userdata at steam and at common/mw2/players
if you deleted both folders and restart the game you should be lvl 1 Again.

this may help
http://www.mpgh.net/forum/191-call-d...nk-lv-1-a.html

lol noob dont press hotkey in-game

^^^^^ Just fallow that, then use eam to import some better stats.

It has to do with the xp you put in.
If your lvl 70, go look at your required xp. If it says something like -82677 and not "0" then you will have to prestige or derank.
Look around for the proper xp numbers.