I Need Your Guys' Help

I logged onto my favorite Day of Defeat server yesterday, and immediately noticed my computer was acting weird. When I walked forward, my character would rush to the wall in front of me. I was accused of speedhacking, and I was banned from the server. I messed around with a few computer settings and realized that the fact that my computer was overclocked was somehow altering the gameplay. Is there any way I can prove this so I can get unbanned? Every person on the server said that they'd never heard of that happening...so what do I do?