No dual boot in Mandriva 2011

Mandriva dvd installed in separate partition on same pc to exiting Vista has no start option for Vista in its boot bar ; pls help to fix

Hello and Welcome.
Please start Mandriva and run these commands from terminal and post your results please, use su - or sudo where needed.

Code:

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fdisk -l

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Code:

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cat /etc/fstab

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Code:

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mount

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Thanks i ve read too late already re-installed both of OSes on my laptop n got a new issue "unsupported executable format error 13" while win boot (my fault i suppose when offer win format to Linux partition tab) Löts of thanks if advise me something.

Did you re-install GRUB? Is this message coming after the GRUB screen>?

VisTA from recovery DVD firstly n Mandriva from LXFDVD

I think you can use the Recovery DVD to fixmbr. Which will overwrite the master boot record and replace it to the default.

At which stage of booting you are getting that error message? Is Vista booting up fine?