get Error code: 0x000000C4 when install windows server 2008

[hadi]

hello
i install virtualbox 5 in windows 7 x64.
when i install windows server 2008 in virtual box, i get attached error:
your pc needs to restart.
please hold down the power button.
Error code: 0x000000C4
parameters:
0x0000000000000091
0x000000000000000F
0xFFFFF800141D0A00
0x0000000000000000
i restart virtualpc. but get that erro again.
please help me
very thanks