Login / keyboard problem

I have a powerbook G4, running Tiger, with latest install 10.4.6. I am locked out of the computer, and need a solution.
My young son randomly typed a few keys while I was using MS powerpoint, and the keyboard stopped working properly. (this occurred the day after installing the latest OS X update). The number keys work OK, however, the letter keys on the left of the keyboard didn't do anything, and the ones on the right would result in numbers being displayed (e.g. in MS Word, powerpoint). everything else seemed to be working OK. I restarted the computer in the hopes that it would solve the problem, but on reaching the login screen the same problem persists, and since I cannot type in a password correctly (doh!), it's now impossible to even login.
How can I login, and solve the keyboard problem. It seems to me that the manner in which the problem occurred, seems more software related (?).
Thanks in advance.
Rob

Ok - solved the problem - num lock (F6) was turned on (never noticed it before, or knew of its function). doh!
Rob

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