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OS Selector problem. Non-system disk error.

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My HD have 4 partitions (all Windows XP SP3). I always used the Acronis OS Selector to choose the operating system on the boot (Acronis Disk Director Suite® version 10.0 (build 2,288).

For unknown reason, now, when I turn the computer on, I see the message "Non-system disk, press any key...".

When I press a key, Windows is started normally (the OS selector doesn't appear and I can not select any other OS).
How can I fix this problem?

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Have you verified in the BIOS that the correct drive is still set as the booting drive?

If that doesn't help, have you tried reactivating OSS?