Itunes and quicktime downloads but wont open

Ok so the other day I turned my cumputer back on and when i turned my cumputer off itunes was working just fine.but when it i turned it back on it wasnt working. So i reinstalled quicktime because everytime i tried to open itunes it said quicktime needed to be installed. So i did so. well that didnt work so, then i uninstalled it all and put it all back on my computer. I have done this a bunch of times and wel its not working and i need itunes. SO PLEASE HELP ME.
compaq   Windows XP  

I have error 2378.
I tried all the fixes (uninstal completely) I've tried installing Quicktime standalone, same error.
One day my computer installed some windows updates. next time i tried i tunes, it said it couldnt' find RICHED20.dll.
Tried removing the updates. then tried removing/reinstalling itunes. Everytime I try to run the install package I get "error with package 2378". I tried restoring my system to before the windows updates. No luck.
HELP

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