Repair the TCP/IP protocol under Windows

Lately, I have had problems connecting to the internet. The connection would last for 2, 3 or 5 hours before it would fail again.
After trying many methods, I found out that the problem was the TCP/IP protocol itself.

There is a way to repair a damaged TCP/IP protocol, which is a core component of Windows.
Under DOS, with administrator rights, type in the following commands :
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