might not be the PC end
when did your router last have a reboot, my old one went cranky and did similar to what you describe, reboot sorted it for a while but eventually needed a new one, the nice bloke at Sky said they only expect them to last 18 months or so.
(localboy purveyor of pisspoor puns, Fri 7 Sep 2012, 13:14, 2 replies, latest was 13 years ago)

Then then send you out another one that is fucked out of the box
/bitter
( sporters I’m sincerely gratitude to you, Fri 7 Sep 2012, 13:16, Reply)

I ended up with two working ones
so have one upstairs as a wireless extender.
(localboy purveyor of pisspoor puns, Fri 7 Sep 2012, 13:19, Reply)

Good stuff

( sporters I’m sincerely gratitude to you, Fri 7 Sep 2012, 13:19, Reply)

It's nothing to do with the router.
All teh other computers on the network are fine.
( b3th Not shit. Not mod., Fri 7 Sep 2012, 13:25, Reply)