getting start with MPU9150

Hi! I`m new of InvenSense products and of such devices in general. I`ve started testing MPU9150 on Windows XP with an USB connection. While I was testing the example `testing Motion Driver using the motionFit SDK and Python script" I found out a black python screen instead of the expected responsive cube. Probably I did not properly understood what does "build the project and load it" mean... I do not know what`s wrong. I have already verified both the motion driver correct installation both the COM configuration.
Trying to make the same thing on a pc with Window 7 (still USB connection), I found out that I could not configure properly the virtual COM, because the system did not find the drivers. I tried to update the driver but I still did not fix this problem. Moreover, with Window 7 I couldn't run the demo, because after the installation an error as "not for 64 bit" occured. Is this a problem of the operative system? How can I fix it?
I`ll be grateful for any help you may give me.