Raise the router/modem up, if it's on the floor. If that doesn't help, can you move it to another location? Sometimes just turning it 90 degrees will work. You should have both 5mhz and 2.4mhz, have you tried connecting to each? Have you moved some furniture around? Maybe you put something in the way of the single.
I doubt it's the router/modem or your PC, nothing changed.
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