Wireless Internet issue

[BDBohnzie]

Figured everyone else had a question, why not me.

Top floor of the house, I have a Linksys wireless G router with Vonage, mixed setup (B/G), with WAP encryption in one room.

In another room, I have my desktop (setup for multiple users) using a USB Wireless adapter (B), a laptop using a Wireless-G notebook adapter (with speedboost), and my work laptop (using internal G wireless adapter). The laptops are used throughout the house.

The issue is while the notebooks stay connected to the internet constantly (no matter where in the house I am), the desktop has an issue staying connected. If I use the computer for a while, leave, and come back to it several hours later, chances are it won't work and I have to reboot. The adapter always shows it is connected to the router, however I have to reboot (repairing the adapter doesn't work either) in order for it to get a signal again.

Any thoughts as to what the deal is? When I lived in my old place, I never had this problem with the desktop. I've updated the driver for the USB adapter, didn't fix it. Rolled it back to a previous driver, didn't fix it. Reinstalled new adapter, didn't fix it. I figured I'd ask for any suggestions before shelling out another $50 for a new adapter.