Some viruses make modifications to your computer's network driver such as changing the DNS settings and deleting some files which are needed for the driver to work properly. As a result of that, you might not be able to connect to the Internet. If you quarantined (deleted) a virus recently you might have deleted the infected network driver files as well.
To restore the deleted files, you need to reinstall your network card driver. You can install it from the CD that comes with your computer (or laptop), or you can download it from the manufacturer's website.
Note: To learn how to download and install drivers, check out the don't know how to download and install drivers solutions.
If you have cleared your browser's temporary files and cookies and adjusted your settings and you still cannot connect to the Internet, there may be an issue with the way the network is configured. In order to correct it, you need to flush the DNS.
Check out the don't know how to flush the DNS solutions to learn how.
Make sure to keep the computer's drivers up to date, because the resolution to the "computer unable to connect to Internet" issue might be part of the latest update of the network card driver.
If you are not sure how to update drivers, check out the don't know how to update drivers guide
If the Wi-Fi network you are trying to connect to is visible and within your device's range, but you can't connect to it, there might be an issue with the Wi-Fi network you are trying to connect to.
Check out the device doesn't connect to Wi-Fi guide, to learn how to resolve this issue.
Internet access issues can be easily resolved thanks to the built-in network diagnostic tool (troubleshooter) developed by the Microsoft team to resolve network issues.
To run the tool, follow the steps below:
If your computer cannot connect to Internet after sleep mode, it is possible that it didn't wake up properly. Try putting it back to sleep mode and waking it up again.
If your device doesn't reconnect to the Internet after you wake it up, and/or if your computer keeps dropping internet connection, disable its network adapter and enable it again.
If your computer is connected to the Internet via an Ethernet cable, check out the don't know how to enable/disable the network adapter guide.
If your computer is connected to the Internet via Wi-Fi, check out the don't know how to enable/disable the Wi-Fi guide.
If you have issues with Internet access, try enabling and disabling the Airplane mode. By enabling and disabling the Airplane mode, you will restart the computer's network adapter and regain Internet access.
Check out the don't know how to enable/disable the Airplane Mode guide if you are not sure how to enable it.
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