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Windows 7 Machine Can See But Refuses to Allow Partitioning/Formatting of 1 TB WD Internal Drive

I have a desperate friend who has a Windows 7 machine into which she installed a Western Digital 1 TB internal SATA drive. The drive shows up in the Disk Management part of Computer Management Control Panel but refuses entreaties to be partitioned, to be formatted, or otherwise modified from its current 'unallocated' state. She tried removing the drive, letting Windows 7 reboot so it sees only the drives it 'likes', and then shutting down, manually reinstalling the SATA 1TB drive and letting Windows 7 try to find it on reboot. The attached screenshot is the result (just as it was before). Any ideas?
potterjazz
Screenshot-Unallocated.png
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Without the new 1TB drive installed, does Win7 still think the boot drive is E: ?
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Dear All....You each came up with some very good ideas. As I had no time to go look at the machine myself, I didn't know that she had not attempted to select "New Simple Volume" when selecting the unallocated drive. Once she did that, it was possible to then partition, format, and off she went. Thanks for your very quick, and good advice here (I learned some things I'll use one day!).
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