Just installed IE9 Beta on one of my boxes running Windows Server 2008 R2: previous IE version was 8 – with minimum of add-ons.
The 32Bit version of IE9 Beta crashes immediately – and does it in cycle: one crash dialog window closes - the next one opens immediately. The 64Bit version does work properly, but… the pages using 32Bit extensions (ActiveX etc.) do not work – as by design.
c:>Program Files(x86)\Internet Explorer\iexplore –extoff
Then disable all add-ons (I’ve disabled all but Microsoft extensions) and restart IE. Step by step enable add-ons and restart IE – until it crashes on start.
In my case it was 4Shared.com Toolbar version 126.96.36.199.
BTW, there’s a very interesting article from Mark Russinovich, describing high-level investigation of random IE crash using debugging techniques: http://blogs.technet.com/b/markrussinovich/archive/2010/06/01/3335060.aspx