WordPress Dashboard Login Error – Windows 7 & 8 Issue?

Hi
I am having this weird issue with accessing wordpress in Win 7 and 8 but not on Windows Vista.

My site is: http://topforeignstocks.com
My admin panel is here: http://topforeignstocks.com/wp-admin/index.php

I am running WordPress Version 3.9.1. I am able to access my admin page fine with a machine running Windows Vista Home. But when I try to access the same with machines running Windows 7 and 8 I am redirected to some junk websites. I tried all kinds of malware and anti-virus programs and nothing is working. So I am wondering if there is an issue with WordPress on Win 7 and 8? It does the same redirect when I access the http://www.topforeignstocks.com site also.

I use Google Chrome the latest version but the same error occurs with others also.

Can you please help me with this weird error? The Win 7 and 8 machines work fine with other websites. Only with my own WordPress site it is redirecting.

Thanks in advance
-David