Using Windows Explorer browse to each of these locations:
- C:\Program Files\Common Files\Apple\Apple Application Support
- C:\Program Files (x86)\Common Files\Apple\Apple Application Support
If one of them doesn't exist don't worry about it. When you open either of the folders look for a file called CoreAudioToolbox.dll, click on it to select, then press Delete on your keyboard to delete it. Confirm that you want it deleted. Again, don't worry if it isn't found, just try the other folder.
Now open the Windows Control Panel, then the Programs and Features control panel inside that. Locate the entry/entries for Apple Application Support. You may have both a 32-bit and 64-bit version. For each that you have select it and click the Repair button.
Try running iTunes now.
If it still doesn't work follow this link to thesecond boxof the Troubleshooting issues with iTunes for Windows updates tip and work though it to remove all Apple software components and then cleanly reinstall it.
In some cases the alternate version of iTunes found at iTunes for Windows (64-bit - for older video cards) may be stable on your computer if the full 64-bit version isn't.
Read the other advice in the user tip if required.
tt2