There's pretty limited options out there for you to try out without spending money.
1. Roll back your wireless drivers to the one that came with the computer.
2. Do a system restore to a known time when the wireless connection was working
3. Reset your OS to factory settings and see if your card can connect.
If none of those will do anything to solve your problems, then it's pretty certain that it's something hardware related. Most likely the adapter died. If you're trying to replace the wireless adapter, you have two options; internally and externally.
1. Externally is rather easy, as suggested above, you can just grab a usb wireless dongle and install the appropriate drivers for it included in the package to get going.
2. Internally is a bit more tricky but provides a cleaner look without having to carry that usb dongle everywhere and at the same time hogging one of the usb ports. You'll have to open up the laptop, which depending on laptop to laptop can be very easy or very difficult, and find out what card type it is (ie. M.2 Type 2230, PCI-E Half Mini Card, etc...) and replace it with the most up to date version wireless card (typically straight from Intel. They usually go for under $40).