If creating a new account works but you can't log in to your existing one, the issue may not be related to the browser installation itself. Since you've already reinstalled multiple versions, I'd suggest checking a few other things:
- Make sure you're using the correct login credentials and try resetting your password.
- Clear all browser cookies and cache related to the site, then try again.
- Test logging in from a different browser or device.
- Temporarily disable VPNs, proxies, antivirus web protection, or browser extensions that might interfere with authentication.
- Check whether your account has been locked, suspended, or requires email verification.
If none of these help, contact the service's support team and provide them with your account name, any error messages you receive, and the fact that a new account can be created and used successfully. That information should help them determine whether the problem is account-specific rather than a browser issue.
Can you share the exact error message you get when attempting to log in? That may help identify the cause.