Vista is pretty prone to screwing up. This is my adventure tonight:
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Ok if any of you know what linux is, I had my laptop dual booting with Vista and Ubuntu. When I installed Ubuntu I told it to install the GRUB files to the same partition as Ubuntu. I've deleted that partition in the past and stuff in the past, however I always reinstalled Ubuntu immediately after.
This time, I wanted to dual boot Vista and XP, so I deleted the Ubuntu partition. Now GRUB doesn't have the files it needs to load. THerefore I am locked out of Vista.
I ran the recovery disc to repair the mbr but apparently there is NOTHING WRONG. Fucking surprise knowing microsoft.
So I used my original plan of dual booting vista and xp as a place to start. I installed xp. That rewrote my master boot record allowing me to use xp. But, I also want to use Vista so I ran the startup recovery thing that previously failed on me with success this time. So now Vista is back but XP is off the map. I used a program called EasyBCD to put XP onto the boot list and it all worked.
Call me stupid, call me retarded, technically adventurous but not technically knowledgable, personally I'd call myself all the above.
This is why I have back ups of all my files

PS - XP is like a bazillion times faster than Vista. 10 second load ups from the point where i tell the computer to load XP.