STMicro AccelerometerP11 update error

Was updating drivers on an e6420 (Win7U) using Dell's auto detect/install. One driver repeatedly failed - the ST Microelectonics Accelerometer (Fall Protection). I manually downloaded the driver package both the msi and the zip packages. Both produce the same error message: "found incompatible installation of, Version. Please uninstall it via the Control Panel Add/Remove Programs before installing this version of Accelerometer". However, the driver/program is already uninstalled - no entry in CP, no STMicro folders, no uninstall data that I can find - only a freefallprotection.log in the root folder. The log does not contain any entries other than my current failed installs. Help!