HOW DO I UNINSTALL osx; 10.9?

It wont support parallels

Michael,
I thought of another alternative today, but that might be moot since you’ve already purchased Parallels Desktop 9. That other alternative would be to use Disk Utility to divide your iMac’s disk into two partitions, and to reïnstall Snow Leopard onto the second partition. This would allow you to reïnstall Parallels Desktop 5 on the new Snow Leopard partition, and ideally just copy your existing Parallels Desktop .hdd file from the Mavericks partition to the Snow Leopard partition, so that you wouldn’t need to reïnstall your Windows applications. (I don’t run Parallels Desktop myself, so I don’t know if other files would also need to be copied.) You would need to boot into the Snow Leopard partition to use Parallels Desktop 5, though; you could do that on-the-fly by holding down the Option key at boot time, or you could use the Startup Disk pane in System Preferences to default to booting into the Snow Leopard partition.
In any case, whether using Mavericks, Snow Leopard, Windows 8 on a new all-in-one, or any other operating system, making a habit of regular backups is an excellent choice to allow contingency options (and thus provide peace of mind).

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