You've ended up posting this in Consumerwatch when it belongs in networking. The FE might move it when he's around later.
In the meantime: you don't need software for that Liteon PCI card, so just install it with the driver and make sure that the software is NOT on the PC at all.
I don't hold high hopes for a good signal, however. Having to go from a basement, through the ground floor and up to the first floor is likely to be too big an ask.