Please open Microstudio, click on the Help Menu, About... command to make sure it shows that the version is indeed 2.400. If this is the case then please try installing the ASPI drivers located at:
http://forum.mtu.com/showthread.php?threadid=493
Try solution 1 first, then Solution 2 to see if these will work.
If you don't have 2.400 installed then uninstall the Microsutdio that you have installed, Reboot the computer. Then reinstall the Microstudio 2.400.
Let me know what happens.