Comodo Av Scanner ; error code 0020


I try to scan my computer with our online Comodo scanner : Anti Virus Scan | Free Online Scanner to detect Viruses and Spyware

But I can’t, when the scanner pop-up window is open, I see an error:

"Comodo AV scanner is not available on a restricted web page.

Error code: 0020"

I am in administrator mode in Vista, I have Firefox 3.6.3 and NoScript (I have autorised all script for the scan).

Thanx. I NEED this scanner !