Thanks, I set memory to 800 MB and was able to boot 2008 11 pre-release ISO.
> You need a *minimum* of 512M of ram for the virtual machine. Anything > less and it won't work. That said, 2008.11 releases (certainly those > based on build 99 or higher) don't currently work with 512M of ram and > require more (768M seems to be ok). We're working on tracking down why > this is, since our goal is to have a system installation requirement of > 512M. So 2008.05 should work just fine in 512M (though very very very > slowly). That said, 1.5.6 is awfully old (and pre-dates Sun's > involvement not that that means anything). While I don't know that your > issues can be solved in the later releases, I do know that I personally > have installed 2008.05 and 2008.11 in both 1.6.6 and 2.0.2 just fine > (with the aforementioned memory caveats). That would be my suggestion, > upgrade virtualbox for starters and add more memory if possible to your > host so you can free some up for virtual machines. > > Cheers, > >