It may happen that the existing user profile may get damaged making the browsing experience undesirable.
Here is how to make a new Google Chrome user profile in Windows (7/Vista/8.x) :
Close all instances of Google Chrome. Then, open the “Run” box (Windows key + R) and type the following :
[ For Windows XP, type the following in Run box:
%USERPROFILE%\Local Settings\Application Data\Google\Chrome\User Data\ ]
In this folder, locate the “Default” folder and rename it to something else (like “Backup default” or “Backup old” and so on).
Now open Google Chrome. This will automatically create a new “Default” folder with the new profile.