vostroyan :
I m planning on doing the custom install from Xp to 7 with the Windows 7 Pro OEM. Pro; has Xp mode. I m more of a gamer so I could just install most my games again. But the only thing that worries me is A. I change my mobo, what will happen. B. If my mobo dies (its new though) what happens. C. If Windows crashes, what do I do? I don't care about MS support, I have google and Tom's hardware for any questions.
vostroyan :
And again I would still get MS updates from an OEM copy?
Whatever version of windows you install, you will get all updates so long as you installed and activated a genuine windows os.
No copies, clones, pirated versions etc. Just one install per license.
Your games will amost always install properly on windows 7 natively; no need for XP mode. Way back, I tried civilization 2.42 using XP mode. It was a poor performing failure.
You are better off using a dual boot with XP and windows 7. Cheaper too.
With retail or upgrade, you can change your motherboard without any issues, just so long as you do not try to use the same license on multiple pc's.
You also can get microsoft support. It was very helpful to me getting upgrade to work on a 32 bit to 64 bit upgrade.
With oem, you are on your own. This forum can only help just so far. OEM is tied to the original motherboard. But, you can certainly replace a failed motherboard, or even use a different one if an exact replacement is not feasible. If reactivation fails, you may have to assure MS that you are not copying the license, and that it is still installed on only one OS.
As to crashes, be prepared. You can roll back updates which can cause problems, but more likely, you screwed up, or contracted a virus or malware infection.
That is why you should be prepared with a suitable EXTERNAL backup.
If you replace xp with windows 7, you are entitled to use the upgrade version.