[ubuntu] Error when trying to install Win7 64bit guest on ubuntu 13.04 server host using VBox

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http://ubuntuforums.org – Hi, I have an ubuntu server version 13.04 and got Virtualbox installed on it. Now I am trying to install Windows Ultimate 64 bit as guest. Well, I can't. Once the setup reaches about 50% all the services related to virtualbox get frozen and can't become responsive again till I reboot the server. The Setup : 32GB Host RAM, Guest : 16 GB RAM. The server logs and screen shows this error when the problem happens : kernel : ACPI Error: SMBus/IPMI/GenericSerialBus write requires Buffer of length 66, found length 32 (20121018/exfield-299) kernel : ACPI Error: Method parse/execution failed [\_SB (Hardware)