can't get into itunes just updated windows 10

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. Right-click on the setup file and run the installer as administrator. In some cases you may also need to disable any non-Microsoft anti-virus software while installing.

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, or want to revert to an older version if the current one won't work properly for you at the moment.

Your library and device backups should be unaffected by these steps but there are links to backup and recovery advice should it be needed.

tt2

1. Are you trying to download and install iTunes for the first time in Windows 10, or are you trying to open an existing version of iTunes for the first time in Windows 10?
2. What happens when you try to install or open iTunes? For example, does it start but then unexpectedly stop?
3. Do you get any error messages? If so, what is the exact text you receive?