This often has something to do with your web browser. Try using another browser like Chrome or Firefox. You can use the following links to download another browser.
If you still can't download a file, try right-clicking on the file and selecting 'Save As' (or something similar - it depends on your web browser). That should start the file downloading to your computer.
If you still can't open a file, it's usually because you don't have the proper software installed. For example:
- PDF file requires a PDF Reader such as Adobe Acrobat Reader
- DOC and DOCX require Microsoft Office or Open Office
Please make sure you have downloaded and installed those programs before attempting to open a program.