Hi James ,
The about:blank stuff what you are talking about could be the default or the blank settings of your Internet browser for your homepage .
Just open Internet explorer. Go to Tools -> Internet Options.
There you might see a column for homepage and under that you might see 3 options: Use Current, Use Default and Use Blank
You might be using the blank one. Click on Use Current and try changing the homepage to google.com/yahoo.com.
Hope it helps.