Device Manager shows coprocessor driver is missing

In Device Manager, under Other Devices in says:

The drivers for this device are not installed. (Code 28)

There are no compatible drivers for this device.

To find a driver for this device, click Update Driver.

When I click Update Driver I get:

Windows could not find drivers for your device

If you know the manufacturer of your device, you can visit their web site and check for downloadable drivers.

I have been able to find a driver for "other devices" on the Acer web site.

Any help or suggestions would be very much appreciated.

Sorry, I left the word not out of last sentence. "I have NOT been able to find a driver..."

Also, in Device Manager under Other Devices the only listing is Coprocessor. I need the driver for that coprocessor.