[Roy Dennis]

I copied this from the XP windows update instructions, note that you must be using Windows Internet explorer for this.

IMPORTANT NOTE: You MUST ONLY use Windows Internet Explorer to do Windows Updates. You CANNOT USE: Firefox, Opera, Chrome, Netscape or any other Browser. To run IE, left click Start button > All Programs > Internet Explorer.
Windows XP Updates are found at http://update.microsoft.com

You MUST do the Windows Updates to run MTU Hoster 4.xx or higher. Many users who had weird problems say these disappeared after updating Windows.

1. When the page above appears, left click on the Custom button. Your computer will be scanned for what updates are not installed.
2. In the left column, select all items under Optional Software.
3. Left click on Install to start the installation.
4. Once the updates are installed, if you see a message to restart the computer, you must do this before continuing.
5. Then go through the same process again until it shows 0 items to be installed under Optional Software updates and Critical Updates.

You might also find this little video helpfull:
http://www.youtube.com/watch?v=TwatSAzXelQ