"The DNS server inst responding" issue

Hi I got the same problem as before my FF(and other browser i tried them all) cant connect to google and other sites
but can connect to this site but i cant download anything.

I had the windows troubleshoot the problem and i got this "The DNS server inst responding"

is there any way to fix this ?
if yes pls tell me.

i use a router what is connected to another xp PC that works correctly.

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