A friend of mine ask me a question about windows 7 If he buys a oem version online say Windows 7 Home Premuim 32 Bit Is It Like Windows Vista Comes With All Version & 64Bit Also Any Advise Could Be Helpful Thanks
If you buy a OEM version, you don't get both 32bit and 64bit. You have to buy 32bit or 64bit. It's only if you buy the full version or the upgrade version you get both 32bit and 64bit. But IF you have access to a 32bit OEM Windows 7 DVD and buy a 64bit OEM version, then you can use that key on the 32bit. But if you use it on 32bit, you can not use it on 64bit later on.
The system builder version is either 32 or 64 not both as said already. If you buy Home Premium DVD you can convert it to a "universal" install disk by deleting the ei.cfg file in the sources folder on the DVD. When you create a DVD without the ei.cfg file you are offered a choice of which version you want during install.