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23 Mar 2010  

Windows 7 Ultimate X64 SP1

have you tried formatting it from the Windows 7 disk rather than booting into windows,

your problem at the moment is that your Bootmanager is stored on the Vista partition (see how its marked as active?), that means if you wipe out Vista you wont be able to boot into 7, hence why 7 wont let you format because it is using some files on C

to fix this problem once it has been formatted you will need to run a startup repair from your disk 3 times: Startup Repair

I'm assuming that ACER is the Vista partition? in which case you wont be able to reintegrate that with your D drive using Windows built in disk management, as it is to the left of the windows 7 partition, you will need to use a 3rd party app such as acronis or paragon

personally... id just wipe out vista, install 7 on that partition then transfer anything important over to the new install and wipe out the current 7 partition and reintegrate it, but the way i posted above will do specifically what you asked
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