Can't login to garrysmod.org because of steam.

When I try to login it gives me an error saying:

This is probably not the site you are looking for!

You attempted to reach steamcommunity.com, but instead you actually reached a server identifying itself as www.google.com. This may be caused by a misconfiguration on the server or by something more serious. An attacker on your network could be trying to get you to visit a fake (and potentially harmful) version of steamcommunity.com. You should not proceed.

And this is what it says when I try to access friends page via steam browser and internet browsers (mozilla IE and google chrome):
bare steamcommunity.com put me in google.com BTW

Google
Error

Not Found

The requested URL /profiles/76561198020359723/home was not found on this server.

Steam store works steam forums don’t, library works. and It’s only my computer others on my network are not affected by this.

sounds like you have virus on your computer. or something

sounds like his hosts file has been edited.
On Windows XP you’ll find it there:
X:\WINDOWS\system32\drivers\etc\hosts

It should only contain Comments(Lines preceeded by #) and this one line