Hola, por fin consegui resolver el problema de las instalaciones pendientes, la solución está en el siguiente link
http://support.microsoft.com/default...;en-us;Q303399
Estos son los pasos que seguí
Salu2
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NOTE: If you try to install Internet Explorer, you may receive the following error message:
A previous program installation was never completed.
You need to restart your computer to complete that installation before running Internet Explorer Setup. Setup will now close.
To resolve this issue, follow these steps:
1. Click Start, and then click Run.
2. In the Open box, type regedit, and then click OK.
3. In Registry Editor, locate and click the following registry subkey:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Contro l\Session Manager
NOTE: In this registry key, Session Manager is two words.
4. In the right pane of the Registry Editor window, right-click PendingFileRenameOperations, and then click Delete.
5. On the Confirm Value Delete message that appears, click Yes.
6. In the left pane of the Registry Editor window, expand the Session Manager subkey.
7. If a FileRenameOperations subkey is listed, click it, and then delete all entries from the FileRenameOperations subkey in the right pane.
8. Quit Registry Editor.
9. Restart Internet Explorer Setup.