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Toshiba A100: '78y5' appears when typing in any application

I have a Toshiba A100 laptop. Just recently, it began to add '78y5' and many other different 'words' when I am typing. It happens in Word, IE, notepad,... any application. So far, I tried different things: formatted the hard drive (tried XP and Vista), replaced keyboard at least twice, replaced the hard drive, flashed BIOS,...
It seems to me that it is a problem between hardware components (perhaps audio and some other). Please, help me out if anyone can deal with it. I read all the posts I found online, not one of them is of help and seems to be just guessing.

I would appreciate some expert help here. Thanks you very much.

ASKER CERTIFIED SOLUTION

Iain MacMillan

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SOLUTION

Danny Child

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abojne4

ASKER

Thank you for your comments. I have not tried the external keyboard.
The laptop keyboard was replaced in the shop, and it could be that they did not replace it properly.
Anyway, I doubt it is software related because I reinstalled clean versions of Windows' several times and updated all the critical updates for soft- and hardware.

Will let you know soon.

Thanks.

abojne4

ASKER

Thanks again for the previous two answers from lainNix and DanCh99. Typing via external keyboard solves the problem (both possibilities PS/2 and USB work properly). I will check with Toshiba services to replace the laptop keyboard. It is a hardware problem, and not a virus (as some suggested).

Thanks again.

Blessings.