After searching the web (and SDN), I haven't found a solution yet.
I have already used the BEX on NW BI 7.0 on my laptop, while it was on MS XP. So I did the whole .NET 1.1 installation, and it worked.
Now I have Miscosoft VISTA RC1, and I didn't succeed in my reinstallation, because .NET 1.1 is not for VISTA, but it appears to be .NET 3.0....
Has anyone tried successfully ?