Virus Causing Website to Not Be Found

Hi I currently play a game called www.Habbo.com and recently my parents blocked the game with Netgear Firewall.

I decided to go on a proxy site called www.vtunnel.com so I can still play the game even though it was blocked.

A couple days later, when my parents finally unblocked the game, I found that whenever I typed in the game address.. it would say "Page Can Not Be Found".

This also occured with my brother who used the same exact proxy site.

We use Internet Explorer 6 and I was wondering if the proxy site was the cause of why I can't play the game? And is there anyway to fix it? I already ran Spypot and Anti-Virus scans and it didn't fix the problem.