was it just a USB wifi device you plug direct to an USB port, or did you have a USB adapter added into a slot on the computer and expected to access network with it?
If Asus logo is showing up on motherboard, is this during the POST just before it boots up? If so, that's a setting in the BIOS that you may be able to turn it off.
If these are programs installed direct to windows, then go into the Add/Remove section and search there for the programs and uninstall them.
So just bought a new desktop from my cousin (he's a computer developer, he built it for me) and it's great! The only problem is that I had to buy an external wifi adapter because there wasn't one built in to the computer itself. It was a ASUS usb adapter and it was awful. I couldn't connect to my internet at all. It also seemed to take over my audio systems and an ASUS logo showed up at my startup screen and I was totally bugged. After a couple of days I went out and bought a new one and uninstalled the crappy ASUS software from the disc hoping it would take the audio control and start up screen with it, but alas, it can't just be that easy can it? It's still shows up when I start up my computer and the realatek audio manager whenever I plug anything into the audio jacks. If anyone knows how to completely 100% get rid of the thing I would love some help!
Thanks.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic