Add an Item to the Send To Menu

Go to this site http://www.microsoft.com/windowsxp/using/setup/learnmore/tips/ferguson1.mspx

It will tell you how to set it up.

Right Click Menu Not Appearing

When you right-click a file or folder and choose Send To and there is nothing there it could be do to a problem in the registry. Go to this site http://windowsxp.mvps.org/sendtofix.htm

Find and remove duplicate files

There are a number of freeware programs that perform this task. Here are a few that I  recommend:

Duplicate File Finder 

http://www.tucows.com/preview/373411

CloneSpy:
http://www.snapfiles.com/get/clonespy.html

DoubleKiller:

 http://www.snapfiles.com/get/doublekiller.html