Stephen Harris wrote:
Has your machine got a bad CPU cooling fan? The work involved in bulk operations like that might be causing it to overheat and perform a thermal shutdown.... or simply crash. I had a Windows machine that would work just fine, except one program would cause a crash after 10 minutes; turns out it was stressing the CPU and causing overheating problems 'cos the CPU fan had died! Nothing else was causing enough workload to cause the problem.
On a related note, try running something like mprime http://www.mersenne.org/freesoft/ to stress the machine. See if it crashes when it is stressed.
Ryan