When installing a program, such as Win Zip, it puts a short-cut in the right-click context-mneu.  To get rid of these you have to edit the registry.  WARNING!!! If you are not familiar with editing the registry then you should find someone that can do this for you.
Select Start/Run, type regedit, and press Enter.  Find HKEY_CLASSES_ROOT, click on the plus sign (+).  Then find * and click on the plus sign.  Next find shellex and click on the plus sign.  Locate ContextMenuHandlers in the Registry Editor's left pane.  Click the plus sign next to it to see keys resembling Windows Explorer folders for every program that has options in the context menu.  Then select the key of the program that you are trying to delete from the context-menu.
Double-click the (Default) value in the right pane to bring up an editing box that has the Value data field highlighted.  Press Ctrl-C to copy this string.  Then press ESC.  Right-click the open key in the left pane and select Delete, then Yes.  Press Ctrl-F to start a search.  With the cursor in the 'Find what' field, press Ctrl-V to insert the numbers that was copied from the Value data field.  Uncheck the Values and Data fields and click Find Next.  The search should stop at a key inside HKEY_CLASSES_ROOT\CLSID.  In the right pane, the default value's data should describe the program.  Press Delete and then select Yes.  You should never see the dearly departed program's menu option again.
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