You normally do not run into troubles when you only install or run Windows Vista on a computer. If you run a multi-boot system however you might face some serious problems depending on the order of installation that you choose. I for one had a problem on my triple boot system that was running Windows XP. I decided to install Ubuntu and afterwards Windows Vista.

There was not a problem with only Ubuntu installed. I was able to load Windows XP and Ubuntu. Once I installed Windows Vista the bootloader was not able to load Windows XP anymore. After looking around for a way to fix this I found the free software Vista Boot Pro which is able to manipulate the entries in the bootloader of Windows Vista. (There is no such thing as a simple boot.ini file that you can edit like in Windows XP).

It took only a couple of seconds to fix the wrong path to my Windows XP installation in the bootloader. Once that was done I was able to run Windows XP from the bootloader again. The other two operating systems worked fine as well of course..