Try and Decide / error / BOOTMGR is corrupt.System cannot boot.

I am using Try and Decide to install a software . When I reboot after install, the computer does not start Windows 7 Ultimate 64. I just have a black screen with the message "BOOTMGR is corrupt.System cannot boot!!! I power off and start up again and the Acronis loader comes up with the choice to Try and Decide or go back and disable.
I tried Try and Decide without installing the software and just rebooting and the same result.
If I choose to revert back to disable Try and Decide, then Windows boots up ok.
I uninstalled - reinstalled Acronis but same results.
Can you help me, please ? Thats really annoying.
Thanks in advance.