Uninstall CP210x v6.6.1 under Windows 7 x64 - Silicon Labs Community
There isn't an automatic utility to completely uninstall the driver. To do this process manually:
Uninstall the driver using Device Manager
Select the VCP device, right click, and select 'Uninstall'.
Check 'Delete the driver software for this device.' checkbox if available; this will remove the driver from the Windows Driver Store.
Click OK.
Uninstall the driver using Control Panel (Add/Remove Programs or Programs and Features)
Uninstall any driver entries such as 'Windows Driver Package - Silicon Laboratories (silabenm) Ports.'
Remove INF files:
Browse to the folder: C:\WINDOWS\inf\ (this may be different on a 64-bit system).
Look through each OEMxx.inf file, and if it references a CP210x remove it and its corresponding PNF file. The default INF files will have silabser.inf in the comments at the top of the file. Customized INF's will have a different name at the top depending on the name given.
Remove driver files:
Browse to the folder: C:\WINDOWS\system32\drivers\ (this may be different on a 64-bit system).
Remove the files: silabser.sys, silabenm.sys.
Remove Registry keys:
Go to Start->Run... and type 'regedit'.
Browse to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\ (32-bit OS) or HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\ (64-bit OS). The default uninstall key is SLABCOMM&10C4&EA60. Any custom drivers will be of the form SLABCOMM&&. Delete these entries to get rid of the 'Add/Remove Programs' entry.
Browse to HKEY_LOCAL_MACHINE\SOFTWARE\Silicon Laboratories, Inc.\Silicon Laboratories Driver Installations\VCP CP210x Cardinal\ (32-bit) or HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Silicon Laboratories, Inc.\Silicon Laboratories Driver Installations\VCP CP210x Cardinal\ (64-bit). The default installation status key is SLABCOMM&10c4&ea60. Any custom drivers will be of the form SLABCOMM&&. Delete these entries to get rid of the proprietary driver installation records.
Browse to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\. Delete the silabser and silabenm keys. These are the services for the driver. Deleting these does not stop the driver service - you must reboot immediately after this, otherwise the services are not unloaded.
You will then need to restart your PC for these changes to take effect.