Well i tried to access a possibly dodgy site but avast gave me the "URL blocked" message before the website loaded up. I'm currently running the scan, however since Avast blocked the site from opening would i actually be infected if Avast was unable to detect? The site tried to redirect me (i could tell from the infected file name) it also had what i believe was a abbreviation for trojan. I'm also using a Mac... should i be worried?