Screen Image "Scoots" to Edge of Monitor

I just downloaded and installed Parallels 4.0 last evening. I had been using Parallels 3.0 for about a year. The problem I'll outline below has occurred in both versions. I don't know whether the problem is caused by Parallels, Windows XP, or my mouse.

Some times when I have images on my monitor when in the Windows side of my IMac and I move the mouse, the screen image(s) scoot(s) to the edge of the monitor so only a small portion of the screen image is showing. If I have two images displayed on the screen, one will scoot to the top and the other will scoot to the right or bottom of the monitor. They don't scoot to the left side because that is where I have my Mac OS icons displayed (vertically). To retrieve the "scooted images," I move the cursor to one of the barely displayed screen images and click on the image. The images then scoot back to the center of my monitor. Has anyone else experienced this problem? If so, how can it be fixed?

 

Some screenshots will be helpful to understand what is going on

 

Screenshot

John, here is the requested screenshot. Above the Finder icon, you can see just a portion of the screen image that "scooted." Also in the lower-left corner, you can see the "Start" button that also "scooted."

 

You configured your Screen corners to be used as Expose,
Please turn off hot corners in System Preferences- Expose