My computer works just fine in ATA, I have no BSOD and everything is great, I am just wondering if it is much better to have AHCI or if i'll be fine leaving it as it is.

wonderful vista,, and problems still-

 

http://en.wikipedia.org/wiki/Advanced_Host_Controller_Interface

 

http://support.microsoft.com/kb/922976

 

there has been some that stated you should enable ahci in the bios before installing vista, and not after you install vista

 

 

you need to read the links.,,it will tell ya the advantage of ahci over ata....achi i believe is hot-pluggable, has support for some other features that ata has not.