Welcome to the forums, serene2000!
Let me be honest with you. Your question here is the equivalent of 'my car wont start'. Now I can understand if you don't know either why that is, that is why you come here. But there is not one single known point of failure that causes BSD to hang in the middle of an install. We'd need a bit more info.
Start with the essentials:
Did you check the FreeBSD 7.0 Hardware Compatibility list? Are all your components listed?
Exactly at what point does the installer hang?
Does it give errors?
PS. FreeBSD is a great system, but it's limit is your choice in hardware. As such I can only run it on one of my machines. It approaches out of the box perfection on that machine, but my other machines do nothing but spit out errors. I'm no expert, but I would first rule out hardware compatibility before anything else.
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Can't tell an OS by it's GUI
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