Update Sys audio problem

I updated a file ac97 sys audio file 29/3 and since i 'm getting blue screen and memory dump,I've tried restore and it does not work,searching for modified file it's not showing,nor is the add remove showing the update.I'm running XP home sp2.All other pdtes have worked ok.Need help on this one.

  Yoda Knight 08:44 29 Mar 05

restart in safe mode by pressing f8 at bootup.

In the device manager, choose to revert to previous driver for your sound

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