I need help with Win 10 on Boot Camp partition.

Hello, i have 13 inch MacPro late 2011 (El Capitan/10.11.04) and I just upgraded to Win 10 from 7 on my Boot Camp partition. I ejected a usb drive but it was under the apple keyboard and trackpad drive category, so when i ejected i lost the ability to use my keyboard and trackpad. I restarted the computer but it did not work, my keyboard and trackpad still did not work. So i wanted to re-install apple support software to see it would work. But while i was trying to do that, due to my unfamiliarity with win 10 i somehow managed to darken my display brightness as well. I know how did i managed that? Irregardless, i did it. And the END RESULT is that NEITHER my KEYBOARD is WORKING, NOR my DISPLAY is BRIGHT enough to SEE the screen on the windows side. AND IF THAT IS NOT ENOUGH.I JUST BOUGHT A PRODUCT-KEY for Win 7(that i used before upgrading to 10) and IT TOO WILL BE LOST IF I DON'T DEACTIVATE BEFORE REMOVING THE BOOTCAMP PARTITION. I don't want to pay 4 another activation key again. CAN SOMEONE PLEASE HELP ME!!! PLEASEEEEEEE!!!!