Still have a feeling the file is getting corrupted.
Microstudio 2.611 should be 3.77 Mg.
Go into the folder where you saved it, find the mstudio2611setup.exe file, righ click on it, click PROPERTIES, and see if it is 3.77mb.
Here's another link relating to that error message regarding Microstudio
http://forum.mtu.com/showthread.php?...rostudio+win32
.
George