Wifi issues

[Superfluous]

Situation:
-At someone's house for the holidays
-I have a mac
-Mac was working fine with wifi earlier today, though it would drop for 1-5 minutes at a time maybe once every hour or two. Annoying, but usable
-Another mac in the house works just fine
-I have a PC partition on my mac, which connects just fine
-There are 2 wifi networks here, 2.4ghz and 5ghz. Both work for my PC and the other mac. Neither works for my mac
-Tried resetting all computers and the router
-Router shows my mac as connected and not blocked in firewall settings
-Network diagnostics and other built-in mac tools haven't given any obvious pointers

Anyone have thoughts on how to fix this? Much appreciated if so - thanks!

 

[Klonaro]

In system preferences highlight your Wifi and then at the bottom click the minus sign to delete Wifi, and then once that it's done click the plus sign and add Wifi again. See if that works.