![Parallels Desktop 4.0 for Mac [OLD VERSION]](http://ecx.images-amazon.com/images/I/51xXh6bhroL._SL75_.jpg) | Parallels Desktop 4.0 for Mac [OLD VERSION]
Buy new: $64.99 / Used from: $31.99 This is the core of your Mac/Windows system. If you've had experience with older versions of PC emulation on a Mac, you know that many of them where just marginally functional - but times have changed - this works great.
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 | Microsoft Windows XP Professional Full Version with SP2
Buy new: $264.99 / Used from: $159.88 This is what I use. I've used it for home use, and to access databases professionally. It runs beautifully.
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 | Microsoft Windows XP Home Edition FULL VERSION with SP2
Buy new: $299.99 / Used from: $139.99 Here is the Home Edition of XP. It's marginally cheaper new, but significantly cheaper used.
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 | Windows 98 SE
Buy used from: $44.99 Windows 98. Not precisely a new system, but it will work. If you are into vintage software, this might just be what you need. Make sure to get SE (Second Edition).
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![Windows Vista Home Premium with SP1 Upgrade [OLD VERSION]](http://ecx.images-amazon.com/images/I/41UjDlEgHsL._SL75_.jpg) | Windows Vista Home Premium with SP1 Upgrade [OLD VERSION]
Buy new: $94.22 / Used from: $45.00 Windows Vista. If you go this route, you'll likely want the latest version.
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