My internet became very slow after a power outage

We had a lightening storm yesterday, and my desktop was on standby plugged into a surge protector. The power went out 3 times, and now my internet does not want to work on my Dimension 1100. My laptop is working fine, so it is not the service provider, but something happened to my internet modem on the desktop. The diagnostics says that the device it working properly, yet I can not even load any web pages due to slow internet.
What should I do? Do I need to reinstall something?
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