Unity 4 crashes on importing packadges

Hi. I have Unity 4.0.0 . When I try to import a larger packadge, it crashes. I oppened the task manager window and start monitoring the ram used. Before crash, the used ram was at about 920 Mb. Right before crash, it jumped over 1000. How could I solve this problem? On my computer, I have 2 GB ram installed. The crash gave me no message, except the error submitting window.

When I import only one image, it crashes too, so is a bug.
I tried the -force-d3d11 but is useless in my Intel HD 4200.