I have restarted my pc normally and it's showing blue screen

[Mochi7J_]

I have done a system update and later i restarted again then it started showing blue screen 

[WAWood]

Bluescreen failures (i.e., BSODs) are notoriously difficult to diagnose and to fix -- far beyond what WE typically can do in this self-help Community.

You have a couple of different options to chose from ...

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The first is that of specialized forums where where folks have vast experience troubleshooting, diagnosing, and suggesting repairs for BSODs.

The community Win11 forums has a section devoted to diagnosing BSODs. So, your best bet would be to post your problem there: https://www.elevenforum.com/questions/bsod/

The community Win10 forums has a section devoted to diagnosing BSODs. So, your best bet would be to post your problem there: https://www.tenforums.com/bsod-crashes-debugging/

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The second is using free software to examine the logs that BSODs produce. This app is known as bluescreenview and is available from NirSoft, from here: https://www.nirsoft.net/utils/blue_screen_view.html

You will then have to go online to do searches with that information to get further suggestions about what to do.

Good Luck