Anyway,thank you for your help,i will always search for the answer. in fact,i suppose that maybe a key in regedit or some choice in gpedit.msc stop me from changing it...but i can't find it...
@EFA11 roflmao, 'Manufacturer: MDL Institute for the Criminally Insane' thanks mate, I really needed a good laugh.
ha,i have killed this problem... change the key will work! if the key is 1,it will not show in system property,and i changed to 0,and OEM back!
...well, you sorted the key issue yourself. I never ran in to 'this' problem - Thank you for showing the solution. Noted for future reference.
Oh...in fact,i never change things in regedit before,and this operating system was found in lenovo knowledge base,so maybe it was changed by lenovo
...most probably, yes. Glad you got it sorted; Hats off, quite an accomplishment for someone without experience!