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The first step to downgrading is to buy a copy of Windows
XP. There are two main editions of Windows
XP - Home and Professional. Windows
XP Home is suitable for most home users, but Windows
XP Professional offers features that more advanced users find useful or more secure, such as a better access control center, a
remote desktop server, and an encrypting file system. More information about the various editions available can be found at
Microsoft's Windows XP website.
Windows XP can be purchased either as retail or OEM. The difference is that retail copies are meant for consumers and can be re-installed numerous times. OEM, or Original Equipment Manufacturer, versions are meant for computer makers and once activated are tied to a single computer profile. OEM makes up for this by being much cheaper, and these days there is little choice to be had between the two. Retail is hard to find as Microsoft has shifted retail sales to Windows Vista, but OEM copies are plentiful and can be found at a major online retailer like Newegg.