Update Nov 8th:

I got DirectRT2010 working on the 4 win XP machines.

Now the problem is the dot probe task. When I run the task on a machine that I have downgraded to DirectRT2008 it works perfectly, however, DirectRT2010 displays the two dot probe stimuli (either images or words) overlapped in a wrong position of the screen (in the upper left). I got the same style file on each computer.

Do I have to downgrade all machine to Direct RT 2008 or there is something I can do to have the same dot probe file running properly both under DirectRT2008 and 2010?

Thanks for your help!

Paolo