There really isn’t much of a difference between oem windows and retail windows. The difference may surprise some users, but in your setup.ini file that is in the directory folder 386 is a pid that pid can be changed to turn a retail copy to an oem or vice versa. oem is not coded to any hardware but the keys for oem are different. I have 2 legal oem keys and no disc this is how I found out, a lot of user run into this problem because discs are not always given out with a machine but often copied to a directory and users tend to lose them to hard drive malfunctions or forget its there then borrow a or download a iso of windows xp to find out they cant use their key. Well you can by changing the pid. So I belive that you could use your oem windows xp as well as the retail version with QEMU. Since only a few numbers and letters in the ini file is the difference.