This is due to the ASPI Drivers. I had answered this on another of your posts this morning. Here is the link to the ASPI drivers
http://forum.mtu.com/showthread.php?threadid=493
This will fix your problems. Do SOLUTION #2 and make sure to make the changes to use this ASPI drivers in Microstudio and Hoster to the USE Default, instead of the USE the MTU installed driver.
If this doesn't fix this, then you have a problem with your computer and it will most likley need to be reloaded.