Does Antivirus Software Interfere With Flash?

I had a problemn a while ago, accessing a certain website (edmunds.com0. my browser would disconnect me-and WINDOZE told me that a certain component of Flash (ver 6.0) was responsible. I dleted Flash, and everything was OK-since then, I upgraded my antivirus SW (McAfee). Now, i cannot downl;oad Flash (7.0)-is the antivirus SW causing this? :confused: