Reputation of IP Address being damaged

[artkaye]

I wanted to register at a website. I was refused registration with this message:

"Sorry, but your IP Address has been listed as a known spammer. You will not be allowed to register".

I am surprised at this disclosure because I use the Net for information and my education particularly for the graduate program in Organization Development I am engaged in. I am an average computer user and I do not have the skills ( I am a Virtual Med Student on VirtualDr) to spam anybody and that is even something that I will never do.
God forbid! What for? I am 56 years old; an Accountant working with a Christian denomination as well as a respected Church leader.

I think someone is using my IP Address to engage in this detestable activity. I am enraged but I need help to stop this before my IP address is banned entirely. I cannot do without the Internet.

Please help!!!!!!!