IO ERROR

try with firefox

Thank you, I just tried but Mozilla can't connect to the internet, and Internet Explorer can't either, but I think it's due to a bad configuration on my end. I'm going to try to fix that and I'll let you know if I still have the error with Mozilla, and thanks again.

So I just managed to get Firefox working, it wanted to connect through a proxy... But I'm trying to upload something from Firefox and I'm still getting the IO error.

What do you download with Firefox?
Do you have only one antivirus and one firewall?
This is to reset Firefox/https://www.commentcamarche.net/faq/9525-reinitialiser-firefox-reset#q=reinitialiser+firefox&cur=1&url=%2F

Haven't you changed your antivirus recently or anything else?
What kind of real-time protection do you have?
Antivirus and firewall??

Don't you have a lead that could point towards resolving your error?
Because there's not much on Google about IO error...
When did it occur?

Have you scanned your PC with good tools?
Try Malwarebytes first/https://www.commentcamarche.net/telecharger/securite/14361-malwarebytes-anti-malware/

"Don't you have just one antivirus and one firewall?"
I only have one antivirus and two firewalls (Bitdefender antivirus and firewall, and the Windows native firewall)
I've tried even disabling both, but it doesn't change anything :/

I don't know what led to my problem... :(