Space bar doesnt work properly-it opens system menu w/out using alt key. Right side alt key opens system menu w/out space bar, left alt key beeps. Thanks!

Apparently your model was probably made in 2005. Examine the keyboard carefully and make sure no keys are stuck in the down position. Look in your Owner's or User's manual - many laptops have a key or key combo that toggles what the behavior of pressing the keys do - you may have pressed that un-intentionally. If that doesn't help your keyboard may be malfunctioning. Keyboards on laptops are are a frequently replaced item, and not all that expensive. Replacing them is usually easy to do yourself once you find out how to remove and replace it. Lenovo /IBM may have a Service or Maintenance manual you can look at. You could try a PS/2 keyboard plugged into the PS/2 port, or a USB keyboard, but you may need to consult your Owner's or User's manual regarding enabling it while booting / disabling the built in keyboard.