Looks like this problem happened because it was part of CS6 Design Standard upgrade and I deactivated and uninstalled the previous version of Design Standard after installing CS6.

Could be something with the way serials work as even when I reinstalled from the original DVD it wouldn't accept the serial number but it did when it started up.

Yes I did try repairing first but it made no difference ... I guess it was a problem with the serial but it was strange as it would start but never open before it stopped. Just a pain in the neck but Acrobat as part of the Creative Suites has always been flakey.

Don.

Found this by an Adobe Staff Member if this other post http://forums.adobe.com/message/4507225#4507225 and it seems to work.

For all the users who have faced a problem where Acrobat did not launch after 30 days of serializing with a suite serial number, please execute the following workaround:

1. Make sure you are connected to the internet.
2. Launch a regular  CS6 product other than Acrobat or Flash Builder (for example: Photoshop, After Effects, Premier Pro, InDesign, Flash Professional, Illustrator, Dreamweaver.)
3. Click on Help->Deactivate .
4. Deactivate the application. Quit application.
5. Launch a regular  CS6 product other than Acrobat or Flash Builder (for example: Photoshop, After Effects, Premier Pro, InDesign, Flash Professional, Illustrator, Dreamweaver.)
6. Accept Eula.
7. Register trial by signing in. Let the app launch.
8. Quit and relaunch the app. Wait for UI to come.
9. Click on License This Software button on the UI.
10. Click on Sign in .
11. Serial number screen will come
12. Enter the serial number in the serial number screen and click Next.
13. Quit app and relaunch the app while connected on the internet .

After this if you launch Acrobat it will launch and run forever without trouble. In case you still face a problem , try relaunching the other CS6 app once more and then launch Acrobat.

Feel free to send me a private message if you need any more help with this.