Here is the fix for Steam Client Bootstrapper not working

[space is cool]

Open up your CMD and type in netsh winsock reset, press enter. You'll need to restart your PC for a complete reset. Then steam should stop crashing.

--Make sure you're running in administrator mode, right click CMD, run in Administrator--

If the fix doesn't work for you, just look for another one instead of crying here because posting it doesn't work won't magically fix it for you. It works for plenty of people. If you tried this fix and it does not work, simply go look for another fix.

You can also try restarting your modem/router, but that doesn't seem to work anyway. Worth a chance though right?

If this fix doesn't work, It is most likely caused by anti-virus in Iridion's case, if you have an anti virus program, deactivate it and try again.

Iridion93

Fixed.
In my case it looks like it was the antivirus' fault. I knew antiviruses often clashed with Steam, but I thought it was fine if I just set it off while using steam, and on while exiting it. I was wrong, because somehow simply having my antivirus installed, even while off, caused Steam to malfunction. Even weirder, with previous updates I encountered no issues.

To all those who still haven't fixed their issue, try uninstalling your antivirus completely, then updating Steam, then reinstalling it (the antivirus). Worked for me.

[Latomurhaaja]

This fixed the problem for me. Thank you!

[Prudolf]

Can you explain a little bit clear?what is cmd? And netsh winsock?😊

[Faceless]

This is working !!! thx Bro

[Faceless]

Originally posted by P90:

Can you explain a little bit clear?what is cmd? And netsh winsock?😊

https://www.youtube.com/watch?v=kXNp5KmqzQs look this video man

[Prudolf]

So,open cmd and write "netsh winsock reset" ?

[B Class Citizen]

YOU DA REALEST MVP THERE IS HOLY SHIEDD

[B Class Citizen]

Originally posted by P90:

So,open cmd and write "netsh winsock reset" ?

yes, but you might want to run cmd.exe as admin

[Prudolf]

Thanks you all guys😊

[Alderkel]

This did nothing for me.

[space is cool]

Originally posted by Alderkel:

This did nothing for me.

What did you do?

[vizualiz.]

Originally posted by Alderkel:
This did nothing for me.

[Dallara]

It seems it works. Thank you very much.

[space is cool]

Originally posted by Junky < Logitech >:

Originally posted by Alderkel:
This did nothing for me.

Explain what you did?

[Alderkel]

I right clicked on CMD, run as admin. typed netsh winsock reset, restarted computer. same problem.

[space is cool]

Originally posted by Alderkel:

I right clicked on CMD, run as admin. typed netsh winsock reset, restarted computer. same problem.

Don't run as administrator and try again.