There are a couple of ways to remove visited sites.
To remove all visited websites go to:Tools > Options > Privacy and select the tab History.
Click on the button Clear Browsing History Now.
To remove specific websites:
- Start typing the URL in the location bar e.g. http://www.microsoft.com.
- If you've visited the website before a pull down list will appear underneath the location bar.
- You can select the sites you want to delete using the mouse or arrow keys. To delete press Shift + Del.
- For multiple deletions you can keep Shift + Del pressed and it will continue deleting all entries in the list.