I'll assume that the PowerPoint shortcut is now sitting on your
desktop.
First method: Hold down the right mouse button over the PowerPoint
shortcut. Drag it onto the Start button and, without letting go of the
mouse button, wait for the Start menu to expand. Continue dragging the
cursor over All Programs and then Microsoft Office (or wherever you
want to put PowerPoint on your Start menu. Once you are hovering over
the desired part of the Start menu tree, release the right mouse
button. It will ask you if you want to copy or move. Select Copy.
Second method (assumes that you have Administrator rights):
Right-click on the Start button and select Explore All Users. This
will open the Start menu structure in Windows Explorer. Expand the
menu tree until you see the Microsoft Office folder. Right-click and
drag the PowerPoint shortcut from your desktop to the desired Start
menu folder.
Third method (assumes that the PowerPoint shortcut has been lost from
the desktop): Right-click on the Start button and select Explore All
Users. This will open the Start menu structure in Windows Explorer.
Expand the menu tree until you see the Microsoft Office folder. Now
right-click on the Start menu again and select Explore to open another
instance of Windows Explorer. In this second Windows Explorer window,
navigate to (your path may vary depending on the location to which you
installed Office 2007) C:\Program Files\Microsoft Office\OFFICE12.
Find Powerpnt.exe. Right-click on it and drag it to the desired folder
in the other Windows Explorer dialog. Release the right mouse button
and select Create Shortcut.
Brian