I have changed my appleID, and now I cant login on icloud for windows (it does not let me updta my appleID

Hi Jack_37_FR,

Welcome to the Apple Community.

Re: "now I cant login on icloud for windows on my PC"

Is it possible the PC is actually still signed in to iCloud using that old ID.

You could try signing out of iCloud on the PC, and then try signing in with the new ID.

Eg:

This support article

What to do after you've changed your Apple ID or password – Apple Support

says:

Windows PC

Open iCloud for Windows and click Sign Out.

• • If you're signed out, sign in with your updated Apple ID and password. The data in iCloud will automatically appear on your device after you've signed in. 
  • If you're signed in with your previous Apple ID:

1. 1. 1. Click Sign Out. Depending on what iCloud options are turned on, you'll be asked if you want to make copies or delete iCloud data (Contacts, Calendar, Reminders, Bookmarks, Photo Stream) from your PC. Click Delete. Your data will remain in iCloud and will be updated on your device when you sign in to iCloud again.
      2. Sign in with your updated Apple ID and password.

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else:

can you access iCloud online on the PC ... simply go to iCloud.com and sign in with your Apple ID.

iCloud.com supports the latest versions of Safari, Firefox, Chrome, Edge, and Opera. 

Learn more about the system requirements for iCloud.

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If needed:

You might want to reach out to the iCloud Support Team:

There is a "Get Support" link at the bottom of their website (link below)

iCloud - Official Apple Support

All the best :-)