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Windows 7 SP1 is the first big update for Microsoft's latest Operating System, Windows Seven.
This Service Pack 1 contains all the updates that have been included in Windows 7 through the automatic updates made since it first appeared.
Windows 7 SP1 also includes other improvements which have been made on the operating system after it was released.
If you have Windows 7, then this download is essential for your operating system to function properly.