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A friend has an Acer Laptop running Windows 7. When she presses the down arrow while in a browser (both IE and FF) it acts like the back button. I checked sticky keys and they are not on. She said that it started around the time that she installed a multidesktop system Yod. But, she uninstalled it and the problem still was occurring. One other weird thing is the fact that I worked on it a while and the problem was there, but then for no apparent reason it started working properly again.

PS she mentioned some other key problems, but I am not sure exactly what all they were.

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Could be a hardware issue. Try a USB keyboard first. Then boot into Ubuntu Live CD and see if the problem exists there. If it does you know it's a hardware issue, if not then it's a Windows/App issue.

If the latter boot into Windows' Safe Mode and/or start turning off processes that run on startup (msconfig etc). If the problem still persists perhaps somehow the keyboard settings in the registry have gone wrong? http://vlaurie.com/computers2/Articles/remap-keyboard.htm

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+1 for mentioning booting into Ubuntu LiveCD. –  Wuffers Oct 11 '10 at 0:23

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