I have just installed VirtualBox on my Windows 7 Ultimate x64 machine specs:
ASROCK Z68 Extreme 3 Gen 3
Intel i5 2500k @ 3.3GHZ
4GB DDR3
1GB Radeon HD6850
I have created an OSX VM and when I go to start it up for the first time I get your standard windows error message saying "Oracle VM VirutalBox has stopped working."
Not sure if it's useful but here's my VBox.log contents:
<Mod: Have mercy on the people who try to read these things - provide logs as zipped attachments, not as pasted text. >
<In any case we have no need of the log so I've deleted it>