Some people may be unhappy with the program they use to surf the internet. Fortunately, there are many browsers developed by different companies, all with their positive and negative sides. So if you want to change your browser, follow these easy steps:
Download an alternative browser (for example, Opera, Firefox, Chrome or Safari)
Your newly installed browser will ask you if you want to make it a default browser at first run. Even if you refuse now, you can do it at any time.
For Opera, go to Tools->Preferences->Advanced->Programs

Tick "Check if Opera is default browser on startup" box and restart the application.
If you use Firefox, go to Tools->Options->Advanced

And click "Check Now". You can also make firefox check if it is default browser every time it starts.
If you decided to use Safari, click the cogwheel icon in top right corner, select Preferences and choose the default web browser from the drop-down list:

Finally, for Google Chrome, click the wrench icon in top right corner of the window, select options

and click "Make Google Chrome my default web browser".
NOTE: Sometimes your internet settings won't apply correctly and default browser setting won't change. In order to avoid that, reset Internet Explorer settings.