The uninstall error you are seeing is not related to Windows 10. Expresscache has two elements.
- The Expresscache driver
- The Expresscache GUI
Both of these elements show in the control panel. The driver shows as Expresscache and the GUI shows as Expresscache app. If you uninstall Expresscache (the driver) first then try to uninstall Expresscache App (the GUI) uninstalling Expresscache app will fail. This is because the GUI is trying to uninstall the driver and it is no longer there.
If you are runing into this issue you must manually uninstall the GUI. Going forward you will need to uninstall expresscache app and it will remove the driver as well.
That said Expresscache still is not compatible with Win 10 at this time. From what I understand they are working on it but I have not seen any additional info on any update or release for this software.
See the link below for manual uninstall instrucitons.
http://forums.sandisk.com/t5/SanDisk-ReadyCache-SSD/Uninstall-Error/m-p/339713/highlight/true#M1606
