Problems w/ X ,Y & Z Axis In Calibrating Saitek Flight

I am trying to set up my old Saitek Flight Yoke with my new computer. I am using FSX. My old system was Windows XP. My new computer is Windows 7 Professional 64 bit. I can't find a CD for the yoke setup (In fact, I can't remember if I ever had a CD when I purchased this hardware ...it was a few years ago). I downloaded the drivers from the Saitek site for the yoke. I then tried to calibrate it. I noticed that the cursor shudders whenever I move the yoke along the X,Y and Z axis. It does not move smoothly when I move the yoke. In addition, it moves around erratically when I return the yoke to its neutral position. Consequently, I am unable to fly any aircraft without the plane jerking up and down uncontrollably. The curious thing is my Saitek pedals work fine after installing the drivers from the Saitek site (I didn't have to use the CD to install them). Any assistance would be appreciated.