Laptop stucks on booting

Hello,
I upgraded my laptop from windows 7 to windows 10 in August and there were no problems. For a month now, it boots till a black screen with the cursor or to the screen with the five dots. The only solution that I have found to boot normally is after five to six resets it boots normally, but next time it cannot boot again. I performed a system restore to a restore point of a month ago, but it came with an error about a problem of my antivirus program. I unistalled my antivirus and I tried again, but this time there were no restore points. What is the problem and how can I solve it? Thank you in advance.

I would start by doing a check disk on the boot partition. Right click on the drive -> Properties -> Tools -> Check drive for errors