Video problem (bleeding? tearing? sync?)

[Aikinai]

Hey everyone, I just recently installed OS X (Myzar's 10.4.5) and it's great. It should tide me over until I get a real Mac in a few months. I have an Inspiron 8200 with GeForce2 Go, and I used Macvidia Beta 2 to get my video card working. It recognizes my card and I can changed resolutions (all the way up to 1600x1200), but I have this weird effect where my windows have horizontal lines to the right of them. Sorry if this is a known problem; I've tried searching for it but I'm not sure what to call it. Anywhere with nothing to the left of it is fine (wallpaper is clean), but if something is on the screen like the dock or a window, to the right of that thing I have white horizontal lines that are always moving. They kinda look like comic book speed lines telling me my windows are flying left really fast. Does anyone know how to fix this or just what it's called so I know what to search for.

Thanks a lot for your help. Also thanks to everyone who works on this project; it's really amazing what you guys can do.