Windows OME

Do you mean OEM.
OEM stands for Original Equipment Manufacture.
These are the versions of Windows sold to a computer MFG / assembler to include with the hardware.

The OEM versions are updated more often then the retail versions. There were 3 OEM versions of 95, but only 1 retail version.

The OEM versions often include extras. Such as the Plus! package, and service packs.

Technically, the OEM version is licensed for specific hardware.
So, if you are a home builder, and want to follow the rules to the letter, you need the retail version.
If you are purchasing a major portion of your system from a retailer, they have the authorization to sell you an OEM version. But, technically, per the Windows EULA, that software is restricted to that set of hardware.

This goes both ways.
In Win95 MS went to SR 2.5 which was available at retail.
If you take a Dell and load the Dell WIN98SE CD on it, then take a retail Win98SE CD and put it in the CDROM; Windows askes you if you want to upgrade to the newer OS. (The retail version.)
Get whichever version is appropriate and then download the patches from www.microsoft.com
If you use this approach on Win98SE you will get a fairly stable PC.
Regards, Chris