modeler crashing when initializing!!

Hello!! My company's director found your modeler software with his friend and asked me to install on his company's computer. The computer is a Windows XP SP3 with .NET Framework (1, 1.1, 2, 3, 3.5 and 4) plus all the updates. No problem at all, the software worked fine. Then he asked me to install it on another computer with the same specs.

The software doesn't work and i simply don't understand why. When i try to run it, i get the message that the .NET 4 is not installed, but it is!! I attached a print of the error!!

Any thoughts on why it can be happening??

Regards,

Eduardo Nicacio