Try using Partition Wizard to convert back to Basic. The latest free version took away that option, but the 4.2 release does have it. If you want to purchase the full version, that's fine, or you can try this copy: UppIT - Free File Sharing - Partition Wizard Home Edition 4.2.2.zip
Extract that to a USB drive, then create a system repair disc or use a Windows installation DVD. See here: System Repair Disc - Create
Whatever you have, boot it up, select "repair my computer", and open a command prompt. Enter:
"f:\partition wizard home edition 4.2.2\partitionwizard.exe"
If you get an error about not being able to find the path, swap out F for D, E, G, H, etc.