Useful Windows keyboard shortcuts

Since before the age of the mice, there have been keyboard shortcuts for common tasks.  My indispensable top six are:
 

• Ctrl Z - Undo previous operation
• Ctrl X - Cut highlighted object or text
• Ctrl C - Copy highlighted object or text
• Ctrl V - Paste last cut or copied object or text
• Ctrl S - Save document
• Ctrl-Alt-Del - Bring up the Windows Task Manager to monitor or kill an application

Look here for a  more complete list.