|Can you try closing all your running programs, and maybe restart explorer? This can be done entirely with the mouse: open task manager with right-click on the taskbar, find explorer in the process list, terminate it, go file->new task (run), and browse to explorer.exe in C:\Windows|
Have you tried plugging in a USB keyboard?
Have you make urgent documents backed up onto USB stick and then reboot the system? If the keyboard doesn't come right and you can't use a USB keyboard, then the computer is useless for now and you'll have to find an alternative while you get it fixed - at least you'll have all your relevant data so you can still (hopefully) meet your deadlines.