[b]YOU MUST HAVE A WIRED CONNECTION TO EITHER PSN OR XBOX LIVE

Step 1: Go to the zombies main menu
Step 2: UN-Plug you Ethernet cable from either your PC or the PS3/Xbox
Step 3: You will be disconeted from Xbox live/PS Network So choose the local zombies
Step 4: Once you are on the local zombies click B Or O if your on PS3 and hover over the "YES" option
Step 5: Plug your Ethernet cable back into the pc or Xbox/PS3
Step 6: Connect back to Xbox Live or PS Network
Step 7: Click the yes option (Once connected back to either Xbox Live Or PS Network)
Step 8: GO back to the main menu
Step 9: Enjoy your reset stats

You may have to try this 1-10 to get it to work