Read this Support Center Article:
http://www.mtu.com/kb/index.php?acti...fefae7e9621219
For some reason, Hoster is being blocked from registering on-line. Thus, the install program is detecting this and switching to the screen to allow using a Memory Stick (or Floppy Disc) to register on another computer.
Try rebooting your computer, disabling your Firewall, or telling it to allow Hoster to communicate to the mtu.com site.