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#11
No.
Not in the command box.
Shut the command box.
Go back to "command prompt", whereever you found it. I think it is usually under the accessories menu. Right click there and look for "run as adminstrator". When a new command box opens, type that EXACT command there. Or paste it in.
You should be able to get a good estimate of the hiber file size by comparing the size of C before you issue the power off command to the size of C after you issue it. I think it is equal to the size of installed RAM??