Can I use Windows 7 OEM?

You can really only get OEM licenses when you buy a new computer. You'd be better off just buying a normal copy of Windows 7.

You might need to buy a piece of hardware such as a HDD, but not all retailers insist on that. Bear in mind Windows 8 is on its way. I'd stick to Linux anyway.

Yes, you can buy the OEM copy. Bear in mind though, you CANNOT transfer this to another computer in the future, or receive any support from MS. The advantage of a retail copy, though more expensive, is you CAN tranfer it to another PC.

Microsoft support is also available.

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