Cannot access web site - HTML:lframe-inf theat

I have been trying to access a web page in which I purchased a ipod recently. I have entered this site previously with no problems, but now Avast! (which I just recently installed) say that there is a threat from HTML:lframe-inf. This is a reputable site, why am I getting this message?

Noone is going to tell you unless you the post link. (Do NOT post the http:// part.)

But generally, the site’s reputation has very little to do with it’s getting hacked/infected.