If your download is somehow corrupted when downloading the latest updates, you can redownload the file by doing the following.
- Remove the folder
C:\Documents and Settings\USERNAME\Local Settings\Temp\X-Win32AutoUpdate
- Start Internet Explorer
- Click on Tools > Internet Options
- Click the Delete Files button
- Start X-Win32
- Right click on the icon in the system tray > Help > Upgrade
This will manually check if there is a new update available.