Spurious characters with "arrow keys"

When I hold down an arrow key, I get occasional unexpected characters inserted in the current document. This happens in MS Excel and in Delphi2006. Any ideas please?
Thanks
Jozef

Hello,
Thank you for your help, but it did not solve the problem. Actually I do not use arrow keys on numerical keyboard (as a part of alphanumerical keyboard)
(7890)
(uiop;)
(jkl;)
(m./)
But I use just the arrow keys on the right-bottom side of keyboard, which do not depend on setting of FN10 (FN10 = Turns the cursor control overlay on or off).
And for example, when I press and hold an arrow key - down, cursor moves down in documents line by line and after maybe 500 lines it insert a character "2" into a document and then cursor continues going down line by line in the document.
Thanks anyway,
Jozef

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    - It only took four more lines of code to turn that code into an SSCCE*, which will generally get more help.
    - Please use code indentation, and the code formatting delimiters, when posting code. It makes code a lot easier to read and understand.
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