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Know the usage to understand if it is virtual machine or a physical machine.
You can run a virtual machine under WIN7 and run whatever OS you might need to satisfy Borderlands. Start-->All Programs-->Windows Virtual PC-->Windows Virtual PC or Windows XP Mode. I have several versions of Linux running as virtual machines on my install in addition to WINXP.
By installing the network drivers provided by the virtual machine.
Unless their is an updated version of Lstyle, you will not be able to install it on Windows 2000. The older version will not run because the file structure is different in the older versions of Windows.
Virtual machine
The short answer is "yes", but the truth is a bit more complicated. When you run Windows on Mac OS X, there's a layer in-between called a "virtual machine". Parallels is one popular virtual machine. VMWare is another. The Windows copy, and the Windows applications you run on it, are open to the same vulnerabilities that they would be if you ran them on a "real" machine (like a desktop PC). If you connect your "virtual machine" to the Internet without a firewall, your virtual machine could be affected by malicious code. It won't directly affect your Mac, but it could use up resources that your Mac applications also use. For example, some malware might use network bandwith by sending spam constantly. While your virtual machine is running that malware, it will also be using network bandwidth. Shutting down the virtual machine will (temporarily) stop it.
Use Windows Virtual Machine or VMWare.
No, bootcamp is not required for virtual machines which are running from mac os x. Parallels is a virtual machine emulator you can put any virtual OS into it without disturbing your Mac OS X system setup. Bootcamp is used when you are installing windows natively on the mac.
From personal experience, I know that Mac runs Windows 7, but definitely not as fast as if Windows 7 was your core OS. Macs just run a virtual machine, which is basically a program running Windows.
If I understand your question correctly, you already have Windows 7 on your PC, and you also want to have Windows XP, Windows 2000, and Windows 98 running as well. The easiest way to do this would be to install a virtual machine and operating system. I recommend VMWare Player, which is a free virtualizing system which is compatible with just about any "guest" OS. For example, I have two flavors of Linux and Windows 98 running as virtual machines on my XP host machine. Other options would include the Sun VirtualBox, or Microsoft Virtual Server. I think VMWare Player is the easiest and most reliable.
Use Microsoft Virtual PC, install a pre-made Windows 98 virtual machine, and then install Riven on the virtual machine. See http://digiex.net/applications/1022-digiex-exclusive-premade-windows-98-virtual-machine-use-older-games.html for links to MS Virtual PC and the pre-made Win98. Installation is easy, and it works flawlessly.
Yes, CA-dBFast works under Linux Wine program, Although, it would be better under a Virtual Machine running Windows.