Product: Windows Vista, 7, 2008
When partition is formatted as NTFS, indirectly there is complication of file owner, and privilege.
When the OS re-installed, all the previous owner will become cryptic user, although the username is identical in new installation (e.g. administrator). Therefore, it will be easier to execute following command to reset its privilege to inherits from parent folder, including sub-directory
icacls C:\Temp /t /reset /c /q
If you still get error, run this
takeown /f C:\Temp