Cannot access Boot Camp Windows after keyboard and trackpad stopped working

Hi,

I was running Boot Camp Windows 7 on my Macbook Air (late 2010) fine, but yesterday all of a sudden the trackpad and keyboard suddenly stopped working on Windows.

I panicked and restarted my laptop using the power button. The trackpad and keyboard were still not working so I connected my external mouse and keyboard, which worked. However, I was unable to access Boot Camp Windows 7 any longer as I've got a completely black screen after rEFIt/rEFInd page and there were no Boot Camp disk to load when I pressed the option(alt) button either.

I searched online and found that perhaps Windows 7 Installer disk (either on USB/CD/DVD) could go into repair the situation. This did not work.

I was still able to access Mac OS X, so I backed up important files in Boot Camp and tried another go at reinstalling Windows 7, but I still get a black screen with no cursor dot. i eventually even tried reinstalling Mac OS X and update to El Capitan, but it didn't work.

I noticed that whenever I access Mac OS X, the mouse/trackpad cursor is positioned at the same position that I was last in as the trackpad/keyboard stopped working (as in even though I moved my mouse "arrow" cursor, if I reboot, that cursor would be positioned at the same spot that I was at when trackpad and keyboard stopped working in Boot Camp Windows 7).

I have tried SMC and PRAM reset (it's strange that doing these reset on the internal keyboard of the laptop works by the way), but the problem is still there.

Is this a software or hardware issue? Lastly, I dropped this laptop about 2 weeks ago, but it was not a severe drop and the laptop continued to work.

Any suggestions and help are welcome. Please help me out here friends!