MBR problem with FreeBSD 5.3 beta

[Pedro n/a]

In the first time I rebooted my computer, after I've finished the 
installation of this version, my motherboard started to beep and I didn't 
know what to do.
After reseting the computer I realized that I could no longer "boot" my 
Windows. I did selected it from BootMng and it gave no response. Even though 
I tried to use FDISK /MBR to rewrite the MBR, all my effords were in vain 
and I couldn't start windows again.
Recently I've reinstalled an old release version (trustworthy) but windows 
still unable to boot.
Does anyone know anything that  could be helpful?

Thanks in advance,
Pedro

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