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Running Windows 7 RC in WinXP host on a Lenovo Thinkpad T60.

When I had 2 megs of memory (2048) I gave 1024 each to guest and host, and the Win 7 machine started OK.

I upgraded to 3072 megs of memory.

If I give 1024 to XP and 2048 to the Win 7 guest, the system crashes spitting out a memory allocation error.

If I give 1536 to each, no crash.

I had hoped to really boost the memory in Win 7.

Is there a reason why the guest memory allocation may not exceed the host's?

First run a memory test program to make sure the Host ram is ok.

Ran Memtest for lots of cycle with no errors reported.

Specific error message? vbox version? if you haven't try vbox 3.0.2