Windows Vista: When trying to reinstall Security Essentials i get error 0x8004FF01; restarting compu

[DaMan]

I started getting Error code 0x8007064e every time computer is restarted; Tried to delete extra anti-virus programs and reinstall Security

Essentials... got error 0x8004FF01.
 
Also can't use Add/Delete Programs utility either from command line or from Control panel. Most of the programs do not show the option to delete or change.


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