Backup Exec System Recovery 2010 - I cannot fully uninstall it after upgrading to SP1

I am having difficulty fully uninstalling Backup Exec System recovry 2010 so that it can be re-installed.

I have a Win 2008 SBS server belonging to client that had a working BESR 2010 installation, due to a minor issue I decided to upgrade to BESR 2010 SP1. SP1 failed during installation indicating problems running "DriverUninstall function in MSIUninstallDriver Function".  This broke BESR2010.
I then tried to uninstall it, but couldn't get the ADD/Remove programs to work fully either as it failed near to the end of the installation.  I cannot now run the BESR2010 installation as it keeps indicating that a newer version has been installed.  I have used the MS Uninstaller Utility to remove the ADD/Remove programs entry.   There is a BESR Unistaller.bat, but that appears to need the files located in the c:\program files (X86\Symantec\Backup Exec.. folder to exist, but these have been removed by ADD/REmove programs uninstallation I attempted.

What else do I need to remove for the BESR2010 installer to properly realise that the it's been uninstalled and to allow a re-installation at BESR2010 (no SP1)?

I still have a "Symantec SymSnap VSS Provider" service, set to Manual.  So perhaps that's the issue.
I suspect that there may be some registry keys that also need to be deleted perhaps?

Any help gratefully received


MazingTreeAsked:
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MazingTreeAuthor Commented:
The current status is that if I run the normal install shield wizard starts, but then says:

"Install has detected a newer version of this technology.  To Install Symantec Backup Exec System recovery 2010 9.0.1.36527 must first be removed through Add/Remove Programs."

How to completely remove everything is the problem?  Then I supect it will run OK.
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MazingTreeAuthor Commented:
Excellent.

Many thanks. I managed to do most of that, but was missing the registry keys to remove.  this will be a useful reference.
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