This is caused by a long-running bug in the Windows code. The gadgets do not auto-adjust their position after a resolution is changed to a bigger one.
Basically, when you are running a game with smaller resolution than your desktop, the desktop will automatically change the resolution to match the game's resolution, adjusting the gadgets to fit that resolution. When the resolution changes back, it is incapable of adjusting them back to the positions they were in.
There is currently no official fix for this, but there are a few workarounds you could try to use.
- You could try exiting Vista_Rainbar before starting the game, and then start it after the game has shut down.
- Running the game in window mode should also fix this problem.