2012 Bombed Windows XP

I'm new here, only trying to get my PC  back.

 

It was time to install a new version so I went and got a new version on CD. Installation did not complete, and Windows files got corrupted. Now I don't have half my programs, and the prompt to fetch a file from MS Office (PRO11.msi) is not available.

 

Nothing in the Norton AV suite works and Control Panel can't uninstall it.  Norton Icon to uninstall doesn't work/do anything.

 

I've been using this product for 15 yrs professiionally and personally. There will be no 16th year unless help is forthcoming.

 

jm