louis vello.......click on this link..
http://forum.mtu.com/showthread.php?threadid=1161
99% of the problem lies with the aspi layer......follow the link to the MicroStudio Aspi Drivers.....download and install......see if that solves your problem...
Also....suggest you run you System File Checker....this will prompt you to re-install any drivers or files that may be missing or got corupted.