i dont know under which category this question should go. please correct me if this is not the place.

have lenovo thinkpad t440 win 10 prof.

have purchased blue tooth handsfree device...

pravin from mumbai india. new to this forum. will move around in the forum. have some questions will post them soon.

helmut thank you for the reply.
i waited about 7-8 minutes after the black screen with personalized settings appeared. should i wait some more time?

gigabyte H81M-WW, intel i7 -4770 3.40 GHZ
win10 update 1809 installed working ok. direct x 12 is seen with dxdiag command. screen shot attached.

with update 1903 --up to lock screen ok. but...

dalchina and mathew wai==thank you for the reply. i have noted the links. but surprisingly just after i wrote in this forum- as a last attempt i went thru one more attempt with media creation tool-...

before 29jyly15, my pc with win8.1 home basic, was upgraded to win10. recently it became non usable due os problems. so i reinstalled win8.1 again.
i wish to know what should i do to reinstall...