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My scroll keys don't scroll properly. When I'm reading a pdf cocument, they work OK, but on all other screens, Word, internet, whatever, and in Firefox or IE, I see the little I-shaped cursor doohickey move up or down the page, zigzagging from line to line, till it reaches the screen top or bottom, and then the screen moves in the desired direction.
I suspect I've fatfingered a wrong key combination sometime, but don't know how to get things back to normal. All advice witl;l be received with gratitude.
Windows XP SP2, Intel Pentium III 1000mHz, 256 MB RAM, regular IBM keyboard.