What to do if your Content server installation doesnt work and you have to install again and its not being properly uninstalled by the program.

Follow the below given steps.

1-delete all the folders related to Documentum from the sysetem , c: ,program files, My Documents. search all the folders named Documentum and its subfolders, delete them all.
2-Delete all the Registry keys from the Windows
3- Start -> Run: regedt32 -> OK (logged on as administrator)
4- Search Documentum using Edit->Search-> Use F3 for going to next item of search.
5- Delete all the registrys
6- Restart the system.

But after doing this , you still have some enteries in legacy which are not easily deleted . You have to follow below given steps.

LEGACY keys cant be deleted(easily) so follow below given steps.

1) Start -> Run: regedt32 -> OK (logged on as administrator)
2) Now to HKLM sub-window and take the key which you want deleted. Highlight it.
3) In the Regedt32 window menu select Security -> Permissions.
4) Change the access permissions for Everyone and/or Administrators to Full Control. Apply the settings.
5) Repeat 1-4 for all keys you need deleted.
6)Close Regedt32 and open Regedit. Delete the keys you don't want anymore.
7) Restart the system and search for the keys again to make sure that they are deleted from the system.

Now you are good to go for installing fresh Content Server installations.

Any positive/negative feedback is greatly appreciated.