Why are some buttons in my laptop keyboard writing wrong characters?

Fawad Mirzad January 5, 2013
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Yesterday I installed Oracle VirtualBox. And just few minutes after installation, I saw that some buttons are writing wrong characters. For example when I write O it writes 6.

After this problem I have uninstalled Oracle VirtualBox, restored my Windows 7 to a state before virtual box installation, disabled antivirus and tried system restore, but seems that nothing is working. I still have this problem.

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