[RBStealth]

your getting either a lot of amateur advice or advice too advanced for your level.

Basically your internal wifi card is suspect.

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If your wifi network card is either bad or there is a wrong setting, you just cheaply and elegantly replace it with an exterior usb replacement.

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.

[RBStealth]

BTW, I own a E6410 as a backup, retired it this year for a new Latitude.

E6410 pretty much lasted me some 9 or 10 years , much longer than any other laptop that I owned. Previous laptops 5-6+ years. But in the past year, it was getting long in the tooth, youtube was starting to be a strain. Plus on top of it I have lots of programming and database apps installed, some of which run in the background upon startup. Time to get a new one.

So your laptop is pretty old and mostly retired by most users. Follow my previous advice in earlier posts.

[Allen In Texas Hill Country]

The USB wireless adapter hopefully looks like the answer. Look for one tomorrow.