7051 and before it shows the splash screen for a split second and then dies on Vista unless I tell it to run as Administrator.
I get no logs in the .IntelliJIdea70\system\log directory.
I tried both JDK5 and JDK6. Both run fine as administrator.
It very well might be an environment issue but there were a few IJ builds that actually ran fine as normal user.
I have IJ installed only for the current user (default option).