Dell E6510 Unknown Device [SOLVED]
Dell E6510 laptops often have an Unknown Device ACPI/SMO8800 when you reinstall Windows 7. Here are the drivers to solve your problem!
PS or you can skip the explanation at the above link and just download the driver here:
(Dell download link)
ST Microelectronics Free Fall Sensor - Dell ACPI SMO8800 Driver (55185 downloads)