[64 bit] Virtual Machine Crashes Host

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http://ubuntuforums.org – I'm currently running 64 bit Ubuntu Studio 11.04 (don't like the huge dash icons in the newer versions), with a 3 ghz. Pentium Core2 Duo CPU and 4 gbs. of ram. I've installed two different virtualization programs, the version of Virtual Box for my specific OS and VMWare Player. I'm trying to run Windows 7, 64 bit and/or 32 bit as my Windows PC is down right now and I have a job to do using specific Windows programs. Both programs run fine to create the virtual hard disc but, in both, when I try to run it to install the operating system everything freezes and all I can do is turn off the comput (Hardware)