Windows 7 - DISKPART at PC Startup
This is an out-line of the methods to boot (start) the PC to open DISKPART so you can manipulate the Solid State Drive (SSD) or Hard Disk Drive (HDD) partitions before you start an installation or for any other reason.
HERE'S HOW:
Method One
Windows 7 Full Installer
1) In the BIOS set the boot order to boot first from the CD/DVD Drive, insert the Windows 7 installer DVD and restart the PC, at the first black/screen hit the space bar for the "Press any key ... " prompt, then at the "Language" screen hold the "Shift" key and hit the F10 hot-key to open a command window.
2) In the command window that opens type diskpart <enter> to get started.
To close the command window when finished type exit <enter> to leave diskpart, then exit <enter> again to close the command window and get back to the installer.
Method Two
Windows Repair CD
In the BIOS set the boot order to boot first from the CD/DVD Drive, insert the created repair CD and restart the PC.
1) At the first black/screen hit the space bar for the "Press any key ... " prompt, after the "Loading Files" screen, select your language, then it'll do a search.
2) Select the desired OS and click next.
3) In the Choose a Recovery Tool dialog box click Command Prompt, in the command window that opens type diskpart <enter> to get started.
When finished with diskpart type exit <enter> to leave diskpart, then exit <enter> again to close the command window.
Then click Restart in the Choose a Recovery Tool dialog box that's still open to finish up.