Intel(R) PROSet Wireless

A couple of years ago, I had the home settings:

Modem to Internet Phone (wan)
Internet Phone (Lan) to Router (Wan)
Router (Lan) to desktop; the laptop was using Intel(R) PROSet Wireless

Everything was working perfectly back then.

Then, the old desktop broke. I hooked everything to the laptop.

Then, the laptop's screen broke. I was not going to fix it, so I deleted/changed a bunch of stuff there. I bought a new desktop. The current desktop is taking the place of the old desktop with the hardware configuration mentioned above. I actually got my laptop fixed, and I opened up Intel(R)PROSet Wireless to connect to the internet. However, it says "Intel(R)PROSet Wireless was unable to detect a supported wireless adapter. Please install a supported adapter." It was detected before; why is not detecting it now? I did not remove it at all.

I tried Window XP's "set up the connection," but it could not be finished. I don't know what to do. I don't know what's going on. What should I do to get the internet back?

Thanks