I've supplied you with a couple of different links that may be, or may not be, of some assistance to you depending on where the problem lies.
If the problem lies with the installation process itself, please refer to the following links and let us know which one it is that you are having issues:
Are you attempting to use the Windows installer wubi? (See link)
Are you following these instructions on creating a bootable USB-stick?
If the download speed is causing you problems, you might try a different download:
If you are attempting to download Ubuntu from here
try the following sources Alternative Downloads, or vice versa.
Perhaps I missed the mark, and your problem lies elsewhere entirely.
Try editing your question to provide a more elaborate and cohesive view of
what the problem seems to be and we'll be more likely to provide the help that