It pops up when you start & log on to your computer ??
or
when you start your browser?? {Microsoft's Internet Explorer? {IE for short}}
If IE- or any other browser you are using- I think something changed your home page URL/site.

this might help fix it-
[Each time you open Internet Explorer, an HTML page is displayed. This is referred to as the Home Page. By configuring the home page settings, you can specify which HTML page you want displayed when you open Internet Explorer.

To change the Home Page, open Internet Explorer, click the down arrow beside Tools and click Internet Options. You have three options on the General tab when configuring the home page. By selecting the Use current button, the web page that is currently open in your browser will become the home page. Selecting the Use default button, the home page will be set to that which was configured when Internet Explorer was first installed. The Use blank button means the home page displayed will be a blank HTML page.]
http://www.lockergnome.com/windows/2...-explorer-v70/
]