This has happened to me on NT and XP and on several computers. If enable a wireless connection and there is a problem with my wireless connection and it can't connect, well the OS kinda locks up. I don't know why, but it's all jerky and its very hard to move the mouse back to disconnect. Once I disconnect everything goes back to normal.
Anyone familiar with this? It just makes no sense to me why this would happen. Finding a wireless connection shouldn't tax the whole system. And it makes troubleshooting a real pain.