Change Registration Name....not just computer name......Hope this helps

Go to start……then to run

Type in regedit….

Click on the (+) sign on HKEY_LOCAL_MACHINE

Click on the (+) sign on SOFTWARE

Click on the (+) sign on Microsoft

Click on the (+) sign on Windows NT

Click CurrentVersion

There you will see  registered owner and registered organization…..change the name and you will be done….

Notice!!!!…….the current documents that you have on the machine will still contain the other owners name……you will have to save them as something else…..delete them….then put them back in your document file…

I hope this helps……