AHCI & IDE mode

i have installed win xp black edition in drive C & win7 ultimate in drive E in IDE mode but when i change it to AHCI mode it does not work..what should i do?please help
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More about ahci mode
  1. You can't change the drive mode with windows already installed (without doing a little repair work). I'd suggest changing it back to IDE and leaving it, as the gains of AHCI are minimal.
  2. You have to do some working on the registries to make working.
    Edit the registries first and then change them in BIOS.
    ^+1 EXT64 : Just leave them be, since the gains is minimal.
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