After uninstalling everything, you should sanitize your Delphi IDE settings (and possibly Windows) by removing what you have manually added, like those invalid library paths and maybe even valid ones. Remove what you have manually added to Windows PATH environment variable.
Then you can install everything. If problems persist, please try to follow the advices in this topic:
If problems persist, then indicate what is the exact problem you are experiencing (error message and/or screenshots), and then please send the file in Logs\logs.zip file.