Built in Audio not working in MacBook Pro after update to 10.7.3

The Built In Audio is not working in My MacBook Pro (Early 2011) after update to 10.7.3; I tried resetting the PRAM and SMC but it didn't helped me out. I can get audio only if i reboot my mac from Safe Mode or reboot after Repairing Disk Permissions in disk utility using the Recovery Partition;. If i make a normal restart or just startup then the built in audio disappers (audio is displayed gray in the menu bar) . Everything was working well with the 10.7.2
- Audio Works well with the Boot Camp Partition. and There is a sound during boot up. 

I dont have any backups and i dont have time capsule or  an external hard drive ready to be used for backup.
My macbook is my the only one computer. The problem is that the animation is lagging when i change the window to dashboard or safari or mail or another window. Inspite of this my macbook works well.
But 5 minutes ago, I noticed that if i run autocad on my mac- the lags go away!!!!

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