To create your primary section dynamic you can use Windows Disk Management snap-in tool to spot but PC will not restart and you will get error message:
NTLDR is missing.

Press Ctrl+Alt+Del to restart.

Cause

This activity happens if the partition marked as active does not contain the Windows boot files or boot files for other operating system. The primary partition that has been manifest as active for establish purposes on Intel-based computers. It must be situated on the disk that the PC gains access to at startup. There can be only one active system partition at a time. If you want to use other operating system, you must mark that system partition active before restart your PC.