Part of the screen has blank spots (not refreshing properly)
I found the issue.
Microsoft Intellipoint 6.3 was providing this problem.
Since there is no easy way to deinstall on a 'normal' way it I've
used
'Revo Uninstaller'.
After that I installed a 5.x version of Microsoft Intellipoint and
problem was gone. I suppose that the 8.x version from Intellipoint
will work also since it looks the old intellipoint versions are not
deinstalled by upgrade, but I didn't try tray yet.
Best regards.
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