how to remove history from computer ?

As you browse the Internet, each of the items you view are saved locally on your hard drive. This helps web pages you visit frequently load faster by loading the files from you hard drive instead of having to downloading the web page again. To conserve hard drive space or to help keep their Internet browsing private, users may find it necessary to delete their Internet History, below is how to do this.

Tip: If you clear your Internet browser history often you may also want to consider browsing in incognito mode.

Microsoft Internet Explorer users
Mozilla Firefox users Google Chrome users
Opera users Safari users
Netscape Navigator users

Microsoft Internet Explorer users

Tip: Users running Internet Explorer 7.0 and above will need to press the Alt key in order to access the file menu to get access to options such as File, Tools, etc.
Viewing History

• Microsoft Internet Explorer 7 and above users can view their history files by clicking the "Tools" menu, "Internet Options", clicking the "Settings" button under the Browsing history, and then clicking the "View Files" button.
• Microsoft Internet Explorer 6.x users can view their history files by clicking the "Tools" menu, "Internet Options", clicking the "Settings" button, and then clicking the "View Files" button.

Deleting History
Press CTRL + Shift + DEL to open the Clear Browsing History window.
or

• Microsoft Windows users running Microsoft Internet Explorer 6 and above can delete their history files by clicking the "Tools" menu, "Internet Options", and clicking the "Delete Files" or "Delete" button. Users also have the option of automatically deleting files each time the close the browser window by clicking the "Advanced" tab and checking "Empty Temporary Internet Files folder when browser is closed" under the "Security" section.
• Microsoft Internet Explorer 4.x users on an Apple Macintosh can delete the history by clicking the "Hard Drive" icon, "System",  "Preferences", "Explorer", and moving the history file into the trash.
• Microsoft Internet Explorer 3.02 and lower users can delete their history by clicking the "View" menu, "Options", open the tab "Advanced", click the "Settings" tab, and click the "Empty Folder" button.

Mozilla Firefox users

Viewing History

Press Ctrl + H to open the left-side history bar.

or

Click History at the top of the window.

or

Users using earlier versions of Mozilla Firefox can also view their history by clicking "Go" and clicking "History."

Deleting History

Press CTRL + Shift + DEL to open the Clear All History window.

or

Mozilla Firefox users can clear their history by clicking the "Tools" menu, "Options", clicking the "Privacy" button, and under "History" click the "Clear" or "Clear Now" button.

Tip: If you don't see the File, Edit, View menu press the Alt key.

Google Chrome users

Viewing History

Press Ctrl + H to open the left-side history bar.

or

Click on the "wrench"  or "Menu" icon, which is located near the top-right side of the browser window and then click History.

Deleting History

Press CTRL + Shift + DEL to open the Clear Browsing Data Window.

or

1. Click on the "wrench" or "Menu" icon, which is located near the top-right side of the browser window.
2. Move your mouse over Tools, then select Clear browsing data...
   
   
3. Select the amount of time you want to go back to delete in your history. You can choose from the past hour, the past day, the past week, the last four weeks, and the beginning of time.
4. Select the types of history you would like to delete. You can choose as many as you like from this list: Clear browsing history, Clear download history, Empty the cache, Delete cookies and other site and plug-in data, Clear saved passwords, and Clear saved Autofill form data.
   
   
5. Click the Clear browsing data button. This will clear the selected types of Internet history for the chosen time period.

Opera users

Viewing History

Click Help and then About. Within the About Opera window you'll see the full path to where the cached files are stored. Browse to that file path to view cached files.

Deleting History

Opera users can delete their history by clicking the "File" menu, "Preferences", "History", and click "Empty now" button. In addition, users can check "Empty on exit" if they wish for this task to occur each time they exit the browser.

Safari users

Viewing History

Press Ctrl + H to open the left-side history bar.

or

Click on the "gear" icon , which is located near the top-right side of the browser window and then click History.

Deleting History

1. Click on the "gear" icon , which is located near the top-right side of the browser window.
2. Click the Reset Safari... link to get the below window. Leave everything checked if you want to clear everything out or just keep Clear history checked to clear the history. Once your options have been selected click the Reset button.

Netscape users

Viewing History

• Microsoft Windows users can view history by first opening Netscape and click the "Edit" menu, "Preferences", "History", and view the location where Netscape is storing your files. Next, open this folder within Explorer.

Deleting History

• Netscape users can delete their history files by clicking the "Edit" menu, "Preferences", "History", and click the "Clear History" button.

Additional information

• how to remove history on firefox
• how to remove history on chrome
• how to remove history on opera
• how to remove clear search 

source http://www.computerhope.com/issues/ch000510.htm