'The Installation Manager's registry information is inconsistent with its installation information "
and IBMIM wasn't starting anymore.
After seen this I've fixed this issue following this steps:
1) backup agentDataLocation
C:\Documents and Settings\All Users\Application Data\IBM\Installation Manager folder
mv /opt/IBM/InstallationManager /opt/IBM/InstallationManager.old
3) Reinstall IBMIM 1.8.7 in same previous location eg /opt/IBM/InstallationManager
After this steps i was able to use IBMIM again and the previously installed software was listed correctly.
For any other details needed please read this link.