You can't delete boot files from G because it is marked System Active, as is F marked active.
As stated earlier, you need to mark those partitions inactive using Diskpart commands, or using free Partition Wizard bootable CD. Then mark Windows 7 partition Active.
Next write the MBR (from G) to Windows 7 partition by booting the Windows 7 DVD repair console, click through to Recovery Tools list to run Startup Repair up to 3 separate times.
If you have any questions about performing these operations or need additional help, just ask rather than ignoring it.