qt-vs-addin-1.1.5 crashes visual studio

I have Qt running with Visual Studio 2008 team suite in a Windows XP. It works fine but when I install the las integrator visual studio crashes before starting.

I tried installing the visual studio integration 1.4.3 with an old key and it works fine :S

Do you know what can be happening?

thanks a lot

can u explain how to use qt-vs-addin, I am new here, tried many times but results into failure.