As The Piney has asked, more information is required.
If windows Vista isnt bootable or fails to boot or something is corrupt you can use the following guide to repair the installation:
http://www.vistax64.com/tutorials/88236 ... vista.htmlTho if something is corrupt, then you may need a new HDD or need to run a 'check disk' before repairing windows. Again this depends on the problem you are having.
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~Just StopSpazzing~
Visit the UBCD Wiki:
http://wiki.ultimatebootcd.comPlease check your
UBCD ISO
MD5 Hash Sum; May prevent issues later on by not having an exact copy.
Currently Working on
Common Issues and Repair Tips on the Wiki.