Windows 0x101 Bluescreens with SMP Enabled (IPI Timeout)

If a VM is configured to have more than one processor (symmetrical multiprocessing, SMP), some configurations of Windows guests crash with an 0x101 error message, indicating a timeout for interprocessor interrupts (IPIs). These interrupts synchronize memory management between processors.

According to Microsoft, this is due to a race condition in Windows. A hotfix is available from Microsoft.

If this does not help, please reduce the number of virtual processors to 1.