Mary new daba pak laptop ma window 8.1 orignal hoi ha mgr us ma partation sirf 1 he ha.to jb dobara window karni pri to sara data ur jay ga.to ma kia kro us ma partatin bn jay ge bagar window ka?ya fir window karny sa hi partation bny gai.ma is lia be new window ni kr rha ka ya orignal ha.to mujy kia krna chahy window karni chahya ya fir isy hi chlana chahya?