If it's just your browser that's affected then check this link provided by powerless in answer to an earlier problem in relation to Browser Branding click here
If Windows Explorer is affected as well then right-click a blank area of your desktop and choose Properties. Click the Apperance tab and then the Advanced button. In the Item drop-down box you can select Active Title Bar and choose your own colour and also the style and colour of the text. There are also many other options you can change.