Q: itunes error 2

Hello,

Recently I downloaded itunes. After a week or so I tried to install a new update. But after that itunes didn't work anymore, the error message I got told me to reinstall itunes. So I did, following the instructions on apple support. I downloaded it again but it won't work. I repeated the progress endlessly: deleting, installing. but always when I complete the ''install wizard'' I get an error 2.

The error says:

''Apple Application Support was not found.

Apple Application Support is required to run Ituneshelper. Please uninstall iTunes, then install iTunes again.

Error 2''

I tried anything i could find on the internet. But without succes. I have a windows 8 Laptop, 64 bit. Does anyone else have the same problem, and does someone know how to fix it?  I am beginning to get really frustrated.. If you have any clue on how to fix this then please let me know.

Thank you very much