|Next time you get the white page ping the site. Is it successful?|
Review your DNS settings in tcp/ip properties. Ping the dns server to make sure you have a live connection.
Our accounts payable person, contrary to policy, was downloading scrapbooking zip files that contained a trojan which delivered a keyboard logger and hacker tools. Our bank account was compromized to the tune of 120K. Fortunately the Back caught it and didn't allow the transactions to take place.
I mention this because you appear to be inadaquately prepared and protected to combat such stealth as in common on the internet now.
Invest in some professional grade software tools to keep your pc protected.