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HI, i´m trying to run WWT, but windowsw shows the error report window, that say that wwt stop working,  so I can´t open the program. I use Windows Vista.

*sigh* having the same problem, here are my specs...

Evga nForce 590 SLI mobo,

2 Nvidia 8600 GT's,

amd athlon 64 x2 dual core processor 6000+ 

2 GB Corsair RAM

Maxtor 250 GB HDD 

oh and everything is updated and i'm running windows vista home premium x86 ver. 

Please verify that you have installed .Net 2.0 and DirectX 9.0c. This thread should help:

 yeah i downloaded the .net framework 2.0 and when i double clicked to install it said i already had it on my system, same thing for the direct x 9.0c

as i said before all of my devices and drivers are up to date. 

You should be able to reinstall DirectX. I had too to solve the same problem. I'm running Vista Utlimate 64bit and it never prompted me that I had DirectX 9.0c already installed (even though I did and WWT was running fine a week ago).