Welcome NetGeek to Mera Windows Community !

OEM are bundled software with any computer system like HP, DELL etc...lets discuss this in reference Windows.

OEM versions of Windows are licensed together with the hardware with which they are purchased, as an entity, and such a copy may not be moved to a different computer. In other hand OEM version of Windows always check BIOS for origial equipment, As long as this is satisfied, other hardware may be changed freely. If you do major changes in computer system such changing Motherboard the test will be failed and enters in normal Activation process at startup.

And its my personal experience...I have a genuine copy of Windows XP Home edition SP2 by HP and I have tried to install this in other system...it asks for Activation process, even I tried to activate but could not possible, but with HP Computer...it doesn't prompts for activation...becoz...its recognize HP Computer as OEM and skip to ask activation as VLK licenced Windows XP. So If we want to use OEM version of Windows, CRACK must be needed.

I think you have heard about the Vista OEM BIOS Emulation Activation Crack...actually it supplies wrong information of BIOS to Windows Vista and Windows Vista predicts computer system as OEM PC and skip to check WPA (Windows Product Activation) and show Windows is already activated.

If anything is going wrong....I request to Admin and Moderators to free to delete this post immediatley.

In my opnion...OEM is not threat to M$