Ok, what kind of router (specific make, model and firmware revision)do you have between your computer and your modem? Also, are you on cable modem, DSL, satilite, or some other variant of connectivity? Also, what antivirus software are you running, and does it contain a firewall module or are you using the windows firewall?
When the site stops responding for you, if you type CMD in the start menu run bar to open a command prompt and ping torhead.com do you get any reply, or a timeout message? Also, what DNS resolver cache are you using? are you using the google DNS resolver by any chance? If so, from the command prompt, does an ipconfig /flushdns have any effect?
Have you ran malwarebytes recently, and if so, did it detect anything?
Edited, Jan 28th 2012 1:32am by Kaolian