https://www.posetteforever.com/viewtopic.php?f=34&t=3475&p=41358#p41358
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Tormie
Thursday, 02 July 2009, 05:47 AM

Re: A Big PC Headache
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Usually, if you're going to install 2 operating systems, you should better partition the drive before installing them, in any case if now both are installed and you can't boot, there are different scenari: the more optimistic one is that you messed up the MBR (master boot record) with Partition Magic. Insert the XP installation disk, choose the console and write

fixmbr

It should work for the first OS, if not, I'm sorry but you've to reinstall all from scratch. The boot.ini can be manually  edited to boot multiple OS if I'm not wrong, I don't understand why you used PartitionMagic if you were doing the work from scratch.

If you had valuable dataon the HD and you won't be able to boot it up your choice is a recovery software