Some applications in Add/Remove Programs list are missing Change and Remove buttons

Change and Remove button missing in Add/Remove Programs:

When you open Add/Remove Programs applet and click an application entry, you may notice that the Change, Remove (or Change/Remove) buttons may be missing, thus leaving only the application name entry there (Fig 1). Here is a method to make Windows show the Remove, Change (or the Change/Remove button together) buttons in the listing. (Fig 3)

RESOLUTION:

• Click Start, Run and type REGEDIT. This starts the Registry Editor. Navigate to:
  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\
  here is Adobe Acrobat 5.0 - Taken as an example
• In the right-pane, do the following:
  Double-click NoRemove (REG_DWORD) and set it to 0
  Double-click NoModify (REG_DWORD) and set it to 0
  

If NoRemove is set to 1, the Remove button will be unavailable

If NoModify is set to 1, the Change button will be unavailable
Visual aid for the Registry editing procedure:

Restart your computer. After you have done this, final result is you'll get the Change and Remove buttons back (Or, the Change/Remove button together)