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Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.
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Also, try deleting it from the command line. Start > All Programs > Accessories > Command Prompt. Type in D: then click your Enter key. Then type in del 1188-3.pdf and then click the Enter key again to see if the file has been removed from the D: drive.