Does the issue occur when accessing a special website, or all Internet websites? How does it work if you boot in Safe Mode with Networking?
Getting into Windows Safe Mode
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If the issue does not occur in Safe Mode with Networking, I suggest you temporary disable firewall and antivirus. However if the issue persists in Safe Mode with Networking, you may try to roll back the network adapter driver.
How to Roll Back a Device Driver
If the above solutions do not work, contact your ISP.
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