Can you post a screenshot showing what you do see? Did you download the setup file from Apple direct? If you're running Windows 10 did you install from the Microsoft Store? Are your system settings set for Spanish, or are you in a Spanish speaking country. I was able to change iTunes into Spanish and back again following the same steps, and I've tested it with Chinese and Arabic before so I know it normally works.
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. When reinstalling right click on the downloaded setup file and use run as administrator. It may also help to temporarily disable any non-Microsoft anti-virus.
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