Problems uninstalling MAXDB. ( instance )

I am trying to completely uninstall my MAXDB but I have hanging DB instance that is giving me a headache.
The instance MAXDB1 doesn't exist anymore (or shouldn't) but if I try to uninstall is asks for MAXDB1 instance drop but I cannot do it since it doesn't really exist.
The removal of this instance was not correctly done so MAXDB still thinks it exists, but I cannot remove it or reinstall it.
Any suggestions?
WIN XP... MAX DB 7.6.00.12
I only want to completely remove my MAXDB installation so I can reinstall the WEB AS.
Thx

I hope someone wiser than I will correct this but this is what seems to help in this case:
1. run the UNINSTALL.EXE provided
2. open the Windows Control Panel, select “Adminstrative Tools” and open the Windows services. There, stop the X Server and SAP DB WWW services. I also check J2E at the same time.
3. once these are stopped you can delete c:/sapdb completely
4. run the cleanup.exe provided to clean up the registry entries (for HKEY_LOCAL_MACHINE ... SAPDBTECH and possibly others) (see regedit.exe, or regedt32.exe, the registry editor)
5. if you Open the Windows Control Panel, select “Add/Remove Programs” and go to MaxDB you probably see it is still there but cannot be removed in the normal way with the button offered. Instead you get the message that the indicated path does not exist - because you have just deleted it.
So you thus have a consistent state that permits a new installation.
Anyone want to comment please? I dont feel good about giving advice - my own installation is stuck at the moment.

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