Torrent sites are blocked

[Rishi87]

I can't access some torrent sites like TPB and Mininova from my Windows XP installation. I get them to work on Ubuntu however. I tried every damn browser on XP. Also I can access them using Proxies. Is ISP blocking them or its kinda Malware culprit?

[Vishal Patil]

May be malware from your ISP... lol