I have tinstalled Photoshop CS3 on both my Windows XP Pro OS and on Vista OS and the program acts the same way on both OS's. The second I create a new document and, for example, just draw a circle with the eliptical tool, it slows waaaay down and if I go to color fill that circle it stops responding all together. Why would this be? Also, in order to not wait for the non-responsive program to end, I start Task Manager to shut it down and I notice that the CPU usage is at 100%. When the program does finally shut down, my computer remains sluggish until I do a restart. Plese advise, thank you.