virtualbox.org

loukingjr wrote:the short answer to your question is, if you assign both cores to your guest, what is the host going to use which is running the guest in VirtualBox after all. The host and the guest will fight for control of the CPU to the detriment of both.

In pretty much the same was as any two programs running on the same PC will fight each other -- normally totally harmlessly.
I'm not convinced this is likely to cause a crash.

wvvls wrote:It finished running the system repair without apparent issues. Switched to 1 core and continues to crash unexpectedly. Attaching the latest log. Maybe there is some sort of hardware incompatibility with windows guest? Should I try updating virtualbox, I guess a new version came out recently?

You could try 4.3.30.
Or even 5.0.2, though I think 4.3.30 is more likely to be bug free.

Strange that there is no information on the reboot. In Windows I get this message after logging in after the crash:

Windows has recovered from an unexpected shutdown.

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 1033

Additional information about the problem:
BCCode: 3b
BCP1: 00000000C0000005
BCP2: FFFFF80002B4C73A
BCP3: FFFFF88001E13C30
BCP4: 0000000000000000
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\082615-116062-01.dmp
C:\Users\Max windows 7\AppData\Local\Temp\WER-540187-0.sysdata.xml

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Will it say the same thing if I turn off automatic reboot or should I go ahead and do that anyway?

How do I upgrade it? There is no option in the synpatic manager in linux mint and trying the following commands didn't work, it didn't find the 2nd one:

sudo apt-get update
sudo apt-get install virtualbox-4.3.30

It hasn't given any problems in 1-2 weeks, before that it was probably rebooting daily. I didn't yet upgrade it to a newer version, so I wonder if it was related to the number of cores, as that is the only change I made? Although it did reboot once after that. Thanks for all the help.