Easiest way to set up a mobile hotspot from my PC?

Hey guys,

Basically, I'm looking for the cheapest or easiest way to turn my PC into a wireless hotspot. Right now, it's hardwired to a modem that's way too far away, and my phone can't even catch a Wi-Fi signal in the room where my computer is sitting.

I need a simple, budget-friendly fix—maybe a USB Wi-Fi dongle, a PCIe card, or some kind of antenna? Something that lets me broadcast the internet from my wired desktop out into the air, you know what I mean? 🙂

Thanks