'There is a problem with this Windows installer package'

iTunes won't install. I keep getting the following message midway through installation;
'There is a problem with this Windows installer package. A program required for this install to complete could not be run. Contact your support personnel or package vendor.'
It all happened a while ago when iTunes tried to update, it crashed straight after initiating the download so I closed it down. Upon opening iTunes again it would just keep crashing so I decided to uninstall iTunes altogether and reinstall the latest version.
Now I'm met with this message every time I try and install the **** thing, I followed the series of troubleshooting like uninstalling all the iTunes files and quicktime ones then trying to reinstall, I tried clearing my AppData Temp folder then reset and tried again and got the same error, then I tried running the windows clean up utility (Which when I ran I found iTunes wasn't present).
I'm completely at a loss can ANYONE please help me? I assume theres a corrupted file somewhere from the original crash but the case is where and what can I do to fix it?
Any help would be greatly appreciated,
Thanks.

If all the basics have failed try deep cleaning the registry and by that I mean
using regedit to "find" every iTunes ,quicktime etc key and reference and delete them this will then give you a machine that has never seen iTunes.
Why do this because iTunes and the other attendant programs leave legion of entries that are not removed by any cleaner I have found .The repeated updating and or installing of iTunes creates this detritus that has confused an installation usually the point at which you post here.This is nothing new in Windows other software vendors have realised this problem and for instance Norton
have a tool that removes all evidence of their AV installation in fact you run it twice to be 100% when having problems with an installation.Until Apple produce a similar tool this is the only way I have come across to solve the multiple
problems users find However to be fair millions of users update itunes every week and have no problems so the chances of it being Apple's fault are very very slim it is unfortunately likely to be an unfortunate combination of issues as mentioned above
BUT if you do not understand regedit do not attempt it get someone who does to help

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