I have played 1-4 without any problems. I imported my character fine. Then when I start the game in Erasmus' house I spin the entire time. Then when I get teleported, I just stand there and kick. I can look at stuff, but I can't move...I just kick and kick and kick. Any ideas?

Do you have any other input devices plugged in besides a keyboard and mouse? If so, unplug them. If the same thing keeps happening, also try swapping the mouse and keyboard for others to see if the problem goes away (since it could be something sticking or a driver issue).

I don't know what operating system you're using but it may also be worth checking that it isn't trying to be "helpful" with various accessibility features since those can mess up a lot of older games.

Are you trying to use WASD keys to move? You need to use the arrow keys or click with the mouse.

Or you can configure the controls using the Keyboard button in the pause menu.