Windows 7 Report of Spam Threat and Unauthorized Email on Forum

I need a moderator, I got a private e-mail message on this fourm in private message box, from a James Cutter saying I was sending spam from my computer and it redirected me to a site. I deleted the e-mail as I do not go to sites that ask to go them so my machine can be scanned.
I just thought I would let some or everyone know about this. I did however change my password to this forum.