Maddening Windows Explorer Search Window Opens on Mouse Movement

I'm going crazy as the Windows Explorer Search Window pops open constantly,
but erratically with mouse movements, scrolling and clicking of the mouse. I
have already spent 6 hours with HP Tech Support and they are useless. Nothing
but generic fixes that caused disaster twice. This has virtually shut down my
business.
Does anyone know how to solve this problem. I have Windows Vista Home
Premium, HP Pavilion dv9220 Notebook PC with 2G RAM

thanks!
Jack