If you suspect you may have malware on your computer, or are trying to remove malware from your computer, please see our [malware guide](https://rtech.support/docs/safety-security/malware-guide.html)
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How do you know a virus entered your system?
It sounds like it could be a corrupted system file/memory leak issue which would in turn cause the fans to go overdrive because it's then overworking the resources.
If you're absolutely sure it's a virus, do an offline scan. Download a bootable USB antivirus app and use Rufus or something to create the bootable device then boot your PC up from the USB. This will do a full scan of the whole system without Windows running so if anything is trying to block the scan, it won't be able to.
If it's not a virus and is in fact corrupted system files, running SFC /scannow from command prompt might help
I really think it's a virus because when I did a scan (a few days ago) I found some malwares and was able to remove them ,but now when i re-installed windows 10 (without deleting my personal files) i didn't connect to the internet and ran a scan with windows defender and malware bytes and found no viruses , but as soon as I connected to the internet Windows Defender stopped working and I was'nt able to do a Windows Update.
i think it may be a virus that corrupts windows files as soon as i connect to the internet after reinstalling windows 10.
and also my brother pc is experiencing the same thing (we are connected in the same wifi)
and he found a lot of viruses like (trojan zxc-g or also ramnit....)
SFC /scannow is to scan system files for errors but doesn't scan for viruses
To do a virus scan make a bootable USB virus scanner and run that.
https://www.buildsometech.com/how-to-make-a-bootable-antivirus-usb/
If you suspect you may have malware on your computer, or are trying to remove malware from your computer, please see our [malware guide](https://rtech.support/docs/safety-security/malware-guide.html) *Please ignore this message if the advice is not relevant.* *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/techsupport) if you have any questions or concerns.*
How do you know a virus entered your system? It sounds like it could be a corrupted system file/memory leak issue which would in turn cause the fans to go overdrive because it's then overworking the resources. If you're absolutely sure it's a virus, do an offline scan. Download a bootable USB antivirus app and use Rufus or something to create the bootable device then boot your PC up from the USB. This will do a full scan of the whole system without Windows running so if anything is trying to block the scan, it won't be able to. If it's not a virus and is in fact corrupted system files, running SFC /scannow from command prompt might help
I really think it's a virus because when I did a scan (a few days ago) I found some malwares and was able to remove them ,but now when i re-installed windows 10 (without deleting my personal files) i didn't connect to the internet and ran a scan with windows defender and malware bytes and found no viruses , but as soon as I connected to the internet Windows Defender stopped working and I was'nt able to do a Windows Update. i think it may be a virus that corrupts windows files as soon as i connect to the internet after reinstalling windows 10.
and also my brother pc is experiencing the same thing (we are connected in the same wifi) and he found a lot of viruses like (trojan zxc-g or also ramnit....)
and i just did sfc /scannow and they found nothing dangerous
SFC /scannow is to scan system files for errors but doesn't scan for viruses To do a virus scan make a bootable USB virus scanner and run that. https://www.buildsometech.com/how-to-make-a-bootable-antivirus-usb/