I experienced a similar problem with MSIWindosx86.iso ... installation would start, but ultimately it would fail. The installer.log said that one of the packages was corrupt.

Increasing my memory from 1GB to 1.5GB and connecting an external monitor allowed me to test other installations ( I hadn't seen that having an external monitor would allow me to have enough screen real estate to complete the installations ).

Since it's been quite awhile, I'm curious if you ever solved the problem you reported.