Thanks for the suggestions guys. I've got 2 identical machines which are new. One newish machine and one old p4 3ghz. None of the 4 were perfectly synced even the 2 identical ones. I tried turning off "enhance pointer precision" in the control panel and now 3 of them are synced up perfectly! That's a start I spose. Lost-ninja is this what you meant by acceleration or are you talking about something else?

The 3 that are synced perfectly are the 3 new/newer machines. The old one still tracks way off. Like if I go to the bottom left to sync then go to start if I then go to my documents, the old machine will be moused over my pictures it doesn't keep up with the others.