This problem can occur if the program you installed creates a registry key name that is longer than 60 characters in length. Add/Remove Programs only lists program names it locates up to the point it encounters this situation.Follow the steps given to solve the problem.

* Go to C:\Windows\Inf folder. In the right pane, scroll down to sysoc.inf. Open it with notepad. It will look like�

[Components]
NtComponents=ntoc.dll,NtOcSetupProc,,4
msmsgs=msgrocm.dll,OcEntry,msmsgs.inf,hide,7

* The word �HIDE� in an entry hides that application from your Add/Remove Programs dialog box. To add ms messenger to the Add/Remove menu, delete the word HIDE from its entry. Don�t delete the �,�(comma) after it.

* Save the file and restart your machine and now you can see that app listed in the add/remove programs list.