I worked though this issue today on my PC and I have it working.
The piece that worked for me was that you have to uninstall apple components in a specific order. I also rebooted my pc after the uninstalls were complete. I found this on the apple support site (see below).
Uninstall in the following order:
iTunes
QuickTime
Apple Software Update
Apple Mobile Device Support
Bonjour
Apple Application Support (iTunes 9 or later)
I then reinstalled 64bit Itunes by saving the package, right clicking and run as administrator.
This reinstalled itunes then I recieved another error, iphone could not be synced 13019. I researched this and I found out that the itunes library could not find one or more of my music files in the library these are denoted by an exclamation mark. I either had to delete the files or double click on the files and click locate and then point them to the location of the missing files. After I had found all of the files it was able to sucessfully sync and all is good.
I hope this helps...