not sure what caused your issue, but if you have the Recovery CD.
1. insert the CD
2. turn off the Laptop
3. take the battery out if you can
4. plug in the AC Adapter
start the laptop and unless you changed the boot menu it will auto read the Recovery CD, and give you instructions...
READ Carefully, and follow all instructions....
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Other wise do you have any other MEDIA which you laptop will boot to. such as a Windows USB or DVD. whic you can do a Clean Install.
this also saves your data to a Windows.old where you can then access all data and recovery that way or at least move.
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If you have other media from which you can boot to. you have other options with which to repair you Boot MBR.