How do I fix this errror when reinstalling itunes

I am trying to reinstall itunes and i am having an issue. I keep getting an error while trying to install and I keep getting very far but I always seem to end up with this.
"Could not open key
UNKNOWN\Components\DA42BC89BF25F5BD0AF…
\b25099274a207264182f8181add555d0.
Verify that you have sufficient access to that key, or contact your support personnel"
I was attempting to reinstall due to an error message appearing when I opened itunes
"Itunes requires a newer version of Apple Mobile Device Support Please uninstall
both Apple Mobile Device Support and iTunes, then install iTunes again."
I have tried a few solutions and for the first error when installing one was an attempt at editing a registry file which I do not think succeeded because I am running windows 8 and was being directed for windows 7.
I have attempted to use this post but it is again about windows 7 and after I select permissions under components is where windows 8 seems to change slightly in comparison to windows 7. I did try only the further steps though and that also did not work.
https://discussions.apple.com/docs/DOC-3581

For general advice see Troubleshooting issues with iTunes for Windows updates.
The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down the page in case one of them applies.
The further information area has direct links to the current and recent builds in case you have problems downloading, need to revert to an older version or want to try the iTunes for Windows (64-bit - for older video cards) release as a workaround for performance issues or compatibility with third party software.
The further information area also has notes on your first issue.
Your library should be unaffected by these steps but there is backup and recovery advice elsewhere in the user tip.
tt2

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