What is a system base driver

I upgraded to W7U x64 and the device manager under other device indicates that two
The drivers for this device are not installed. (Code 28)
To find a driver for this device, click Update Driver.
It can't find them automatically. Any suggestions what they are and where / how i could fix that
Regards

it would help to know which Lenovo System you've installed W7 on, even better post the Type and Model Number this will help members to help you. If it ends in CTO please provide some details about it. Please do NOT post your s/n.
Andy  ______________________________________
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