Windows 7 OEM?

An OEM disk is cheaper because it does not have any support from Microsoft and can be used on only one computer. If you changed the motherboard for example you would need a new key code to activate it. If you do not plan to make any major changes to your computer I would go with the OEM.

What is the difference between the OEM, and the Retail version of Windows Vista?

There are 3 major differences between these 2 items. The physical DVD disks themselves contain exactly the same content.

1. OEM copies of Windows Vista come in either 32, or 64 bit flavors. You must decide which version you want, and make sure you purchase that copy. With a retail copy, you get both 32 and 64 bit Windows Vista DVD’s in the same box.

2. OEM copies cannot be transferred from one PC to another. Once you install an OEM copy of Windows Vista on a PC it must remain with that PC forever, unless upgraded to a newer version of Windows in the future. Retail versions can be moved from PC to PC, but your retail copy of Windows Vista cannot be installed on more than one PC at any given time.

3. OEM copies do not come with any support from Microsoft. If you need to call Microsoft for support with Windows Vista, you must pay a fee to do so. Retail copies come with a phone support incident included in the price.

FROM the Prophecy !