Q: Trackpad and keyboard not working after upgrading to Windows 10

1. You can power down your Mac and power it back up and hold the Alt/Option key.

2. You can also run the following to procedures to reset the default OS.

3. If you are using a 2010 Mac to run W10, officially Apple does not support the combination. Macs older than 2012 are not supported for W10.

4. Please also see Boot Camp: Set the default operating system .

BC6 drivers will not work on a 2011 MBP. Can you use Install Windows 7 and earlier on your Mac using Boot Camp - Apple Support and install the latest 5.x drivers appropriate for your Mac model? To clarify, are your built-in keypad/trackpad not working or are these external BT ones that do not work?

You can also try

Resetting the System Management Controller (SMC) on your Mac - Apple Support

How to Reset NVRAM on your Mac - Apple Support

If you do not need to preserve any Windows data, you can use BC Assistant, remove Windows, and install a new copy of W7. If you need to back up files (not your applications), you can copy them from the OS X Finder to an external back up drive.