Last week there were 2 PCs at work that were running so slow, usual complaints from my co-workers.

The PCs are 2 different brands (Dell and Lenovo), I ran Speccy then found out from the output that both CPUs were over heating. I opened up the 2 computers and saw bulging capacitors on both Motherboards - coincidence?
I said it '
might' help, you may of course skip updating the network adapters if you wish and since all wireless devices aren't able to connect to your Netgear router. I had to go back again and re-read your initial post.
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If my adapters were outdated, shouldn't my smartphones still be able to connect? And putting that question aside, it would be rare for every network adapter in every laptop to be outdated, right?
This is not needed, it was a mistake, sorry....
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Which device do I go on to the device manager? My laptop or my computer(which is connected directly to the router)
Back to your issue - Who is your ISP? Do they require enabling Mac cloning from your router setting? Have you done this also?
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Just checked all WLAN Auto Configs, all have started but the wifi is still not to be seen... Do you think its something to do with the router settings?