spend some dollars on Ebay:
“usb wifi adapter”
buy a low priced item and a mid priced item.
If this doesnt solve your problem , nothing will.
For the mid priced or higher item buy a wifi dish adapter.
your getting either a lot of amateur advice or advice too advanced for your level.
Basically your internal wifi card is suspect.
Look at my previous:
buy a replacement usb wifi adapter
or go whole hog with something like this:
https://www.ebay.com/itm/Hawking-Hi-Gain-Wireless-150N-USB-Network-Dish-Adapter-HWDN2/201695776833?epid=150761249&hash=item2ef6015041:g:6UEAAOSwW6Rcoiiy
On the other hand, reinstalling Win7/10 is the cheapest route.