If you want to simply move your EE installation directory, do not reinstall ExpressionEngine. If you do so you may destroy and overwrite all of your data, Templates, and other settings.  Here are the generic steps you’ll need to take to move your installation directory to a new location:

1. Copy your directory contents to the new desired location.

2. Ensure that your files and directories still have the correct permissions.  Consult the main installation instructions to see what permission settings you need.

3. Open up the ExpressionEngine Control Panel (at the new location) and update any necessary path settings. Usually, this consists of the path information found in the following areas: General Configuration, Weblog Management, File Upload Preferences, Global Weblog Preferences, Membership Preferences, Captcha Preferences, Emoticon Preferences.  If you save templates as text files, update the ‘Basepath to Template File Directory’ in ‘Templates- Global Template Preferences’.  You may or may not need to modify all of these.

You may also need to modify the My Weblog link in your Quick Links section.