Hi,
Check your Antivisrus and FireWall setting and
try to use Free download manager
http://jdownloader.org/download/index
If you have any problem with JDownloader
use the JDownloader support boards, search on "unable to write to disk" or "No permission to write to file", there are zillions of posts.
Some of the recommended solutions:
- use less chunks
- allow java.exe, javaw.exe and jDownloader in your firewall
- unstable internet connection, contact you ISP
- reboot PC
- uninstall/re-install firewall
- uninstall/re-install virus scanner
- torrent client using too many connections
- uninstall JRE (java) and re-install latest JRE version