Why can’t I acces McAfee’s SiteAdvisor website(www.siteadvisor.com)?

I can access it from school so there's no country restriction(Romania). I've installed SiteAdvisor about 2 years ago and it worked fine. After changing my antivirus from Avira (free edition) to Bitdefender 9 Professional(kept it 1 year) and then back to Avira Free I couldn't open SiteAdvisor's site. I can't open the site neither in Internet Explorer(6) either in Firefox(latest version 2.(something).14 with Noscript , Adblock Plus , Coolris Piclens and some others). Even if I disable all my Security programs(Avira, Comodo Firewall Pro 3, Spyware Begone!) I cannot enter the site. Please tell me what to do. Thanks in advance:).

Related posts: