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I'm trying to shrink my Windows 7 partition on my 400GB HDD down to about 200GB to dual boot Ubuntu, and I have consolidated all my data and defragged a number of times with different programs (PD12, Auslogics, Acronis DD), including before Windows boots up, and I just cannot get this one system file to budge. Here's a picture of the current drive map:

The orange box at the bottom is the file I'm unable to uninstall it and I'm really at a loss here. Any advice?

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How about backing up your system, shrink the drive, then restore. Worst case, nuke the drive and repartition it, then restore your backup.

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