Windows 7 OEM License Without SP1 on SP1 ISO

[Ksurvivor]

Hi everybody. I have an OEM Windows 7 PC that's getting slow and bogged down and I've decided to reinstall Windows on it. (I've tired cleaner with no luck; I've decided to start out fresh However, instead of using system recovery options through my recovery disk/ partition I'd like to avoid the bloatware problem and reinstall windows through a legal Windows 7.iso and activate using the OEM key. Here's my problem: From what I've researched, any isos you use to reinstall windows must be the same version as the one tied up to the OEM key. The iso I've downloaded is Windows 7 SP1 Home Premium, but my PC came with Windows 7 Home Premium without SP1;
it wasn't released yet. So will I be able to reinstall with the SP1 iso and activate using the OEM key, or will I have to redownload a version of Windows 7 iso without SP1?

 

[Abmario]

Most probably your key won't match.. I would suggest you to contact MS on this regard, However,

OEM versions of Windows 7 are identical to Full License Retail versions except for the following:
- OEM versions do not offer any free Microsoft direct support from Microsoft support personnel
- OEM licenses are tied to the very first computer you install and activate it on
- OEM versions allow all hardware upgrades except for an upgrade to a different model motherboard
- OEM versions cannot be used to directly upgrade from an older Windows operating system
http://www.tomshardware.com/forum/67279-63-reinstalling-windows

You may refer Windows versions in here:
http://us.informatiweb.net/logiciels/29--windows-7-all-editions-with-and-without-sp1.html
vs.
http://www.sevenforums.com/tutorials/219487-clean-reinstall-factory-oem-windows-7-a.html