How do I undo MW2 patches

I was really bummed when the current patch nerfed the 1887s. Is there any way to undo a patch or reinstall without updating to current patch? I have tried reinstalling MW2 and making sure that the game was set to not automatically update, but it didnt help the game still updates on its own.

Lol, even if u possibly done this, there would be no one on the servers of the patch...i think o.o

Im still on 1.0.166 and so is a ton of people!