If i'm right, then this is the configuration for Ignite itself, not the internal components, a Ignite developer would have to confirm otherwise. The configuration is whats telling if you have the version NETFrame for it to work, which would be
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0,Profile=Client"/>
<supportedRuntime version="v2.0.50727" sku="client"/><!-- Only .NET 3.5 SP1 -->
.NET 3.5 SP1 is what i had when i installed Ignite, i'm not sure why my current 4.5 isn't showing up on the configuration but i'm going to try to uninstall, CClean, and re-install.
Again, its more of a internal error than anything, but i may be somewhat wrong, each config file has the same config coding. They would have to do a whole revamp of Ignite if the white screen error keeps coming up, possibly.
Windows vista is able to support Ignite, and SP2 is also. The NET you're probably trying to install is a lower version? Try to use 4.0 or 4.5. But my money is still on Ignite internal error.
EDIT: I just re-installed, once more, and the config is the exact same as before. So yea, it isn't our computers, its Ignite.