Installation difficulties

I have Win XP Home and IE7.Further to a previous Post where I stated that although I can download Windows Updates they refuse to install I find it now applies to other programs eg AVG.I was wondering if there is a particular file in XP which is an installer file and it might be missing in my case.If anyone knows if this might be so and knows from where I can download such a file I would be most grateful.

  VoG II 13:38 08 Mar 07

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