How do I close an open proxy?

My isp qwest has repeatedly cut my service due to apparent malicious software being sent from my account - this is an 'open proxy' and I'd like to know how to close it. HEEEEEEEEEEEEEEEEEEELP!How do I close an open proxy?
Sweep your computer for malware. That should remove the proxy.



Also, you should probably buy a router. A router will block all incoming connections by default, so a proxy wouldn't be usable.How do I close an open proxy?
antivirus, anti malware, spyware



Sometimes it might be easy to reinstall the whole system.