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See if you can at least get the machine to start in Safe Mode.
Start or restart the machine and as soon as you see the manufacturer's logo on the screen, start tapping the F8 key
(this has to be done before Windows tries to start) You should be brought to a black advanced boot options screen.
Use the arrow keys to select Safe Mode and press Enter. This loads Windows with just basic drivers so your keyboard and mouse should work at this point.