The problem you are experiencing is
generally due to one of the following three reasons:

• No Internet connection: Please ensure you are connected
  to the Internet when attempting to perform a Registry Kit Update.
• Firewall / Proxy Server blockage: You may need to
  temporarily disable your firewall or proxy server to perform Registry Kit
  Update, as these could interpret the Registry Kit update function as a
  malicious process. If possible, place Registry Kit 's 'update.exe' on your
  firewall or proxy server's 'Allowed Processes' list. This will allow you
  to run future Registry Kit Update, with your firewall or proxy server
  enabled.
• Virus Scanner interference: You may need to temporarily
  disable your virus scanner to perform a Registry Kit Update, as these
  could determine the download as an attempt to infect your computer with a
  virus. Please remember to re-enable your Virus Scanner when Registry Kit
  Update has completed.