Ok , this was the process.
subah 7:50 se laga hun iske piche.
windows open ho rahi thi but main screen dikhane ke 1-2 min baad hang ho ja rahi thi. nothing working. So I had to switch off power button to shut it down. 3/4 baar try karne ke baad I tried safe mode with networking . it worked and I saved folders and other items from C drive to D drive. in case windows format karna pade to iske liye. I uninstalled few softwares installed in last few weeks like cccleaner and system mechanic. fir bhi kuch nahi hua. then system restored to 3 november. but normal mode still not working. then again safe mode mein chalaya. phir aapne bola ki last known good config mein chalao to maine system shutdown kiya par on karne par normal mode khud hi theek se kaam karne laga hai. good config wala dialogue abhi try nahi kiya hai.