Another Crazy Mouse Issue

Ok, my brand new Dell latitude was delivered today with Windows 7. My mouse (I have tried both a wired one and a wireless one) is switching from the standard pointer to up and down (and sometimes sideways) arrows, and then out of no where, a magnifying glass shows up. The screen starts jumping, shrinking in and out, bizarre. It is extremely difficult to navigate now and I consider myself somewhat tech savvy.

I have gone back into my system setup for the mouse and everything seems ok.

Any help would be greatly appreciated.

Thanks,

Michelle