Yes, even Windows 7 can crash. And one may want to know why. Looking for .dmp file you may be very surprised: the .dmp file won't be saved on the local disk.
It is not a bug - it is the new feature in Windows 7.
After hours spent to locate the reason, found following article @ OSR: one of my favorite sources regarding Windows kernel.
"By setting the \HKLM\System\CCS\Control\CrashControl\AlwaysKeepMemoryDump DWORD value to 1 you will guarantee that you will always have a crash dump file after crashing the system."
Set the registry key an enjoy!