I have Virtual Box Version 4.2.14 r86644 running in Windows 7 Professional 64 Bit,i7 processor and 32GB DDR3 (Dell Precision M 4700 Mobile Workstation).I have installed Windows Server 2012 Standard successfully in Virtual Box. But tried to install Windows Server 2012 R2 in Virtual Box Version 4.2.14 r86644 (system Settings-2 Processor, 4GB RAM, 70GB HDD Fixed) it showing error message Your PC needs to restart. Please hold down the power button Error Code :0x000000c4 Parameters: 0x0000000000000091 0x000000000000000F 0xFFFFF80041BCAA80 0x0000000000000000 I tried with different media (DVD) but the same error occurred.