Corrupt Security Essentials won't uninstall to re-install

[System]

In trying to get Google Earth to work (again) I have been uninstalling certain things. I uninstalled security essentials
via add / remove programs.

Now, on booting it says it won't open that. No surprise, since I thought I deleted it.
But when I go to MS to try to re-install, it says it's already installed, so must first uninstall.

So I go back in to first uninstall, again, it says can't find files to uninstall. Thus it's apparently corrupted.

So how can I get rid of corrupted version, so I can re-install? System: XP Home, 32 bit PC with sp3.



thanks

Google Earth will be a separate issue.

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